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Des films et revêtements composés de phases et composés intermétalliques présentent des propriétés et des combinaisons de propriétés attractives qui ne sont que très partiellement explorées aujourd’hui. Ils sont porteurs de solutions potentielles pour conférer à des matériaux avancés des multifonctionnalités nécessaires dans pratiquement toutes les industries manufacturières et deviennent ainsi source de rupture et d’innovation. Cette situation prévaut pour le système Al-Cu-Fe, au sein duquel même les binaires à base d’Al présentent des propriétés remarquables. Si des techniques de dépôt physique en phase vapeur sont le plus souvent utilisées pour l’élaboration de tels films et revêtements métalliques, l’utilisation de procédés de dépôt chimique en phase vapeur à partir de précurseurs métalorganiques (MOCVD) permettrait à terme le traitement et la fonctionnalisation de surfaces de géométrie complexe. Le présent travail s’inscrit dans cette logique. Il vise la mise au point de procédés MOCVD de films d’Al, de Cu et de Fe. Ces procédés doivent être compatibles afin de constituer la base pour l’élaboration de protocoles complexes permettant le codépôt ou le dépôt séquentiel de ces éléments. La MOCVD d’Al à partir de dimethylethyl amine alane (DMEAA) a été adaptée pour satisfaire les contraintes de codépôt, pour valider le dispositif expérimental utilisé pour le dépôt des films unaires et binaires, pour valider certains aspects mécanistiques du dépôt et pour illustrer la capacité de la technique de couvrir de manière conforme des surfaces de géométrie complexe. Le protocole mise au point permet d’opérer à une pression de 10 Torr, dans une fenêtre de températures entre 160 °C et 240 °C. La modélisation du procédé permet son optimisation dans ces conditions, conduisant à des films d’épaisseur uniforme sur une surface de diamètre 58 mm. La microstructure désordonnée des films est améliorée par un prétraitement plasma des substrats d’acier 304L in situ avant dépôt.Le besoin d’utiliser des précurseurs de Cu et de Fe exemptes d’oxygène (en vue d’un codépôt avec Al) a conduit à tester pour ces deux éléments la famille originale des composés moléculaires à base de ligands amidinates. Il est montré que des films purs de Cu sont obtenus entre 200 °C et 350 °C à partir de [Cu(i-Pr-Me-AMD)]2 dans une phase gazeuse riche en hydrogène, la limite entre les régimes cinétique et diffusionnel étant à 240 °C. Le criblage de précurseurs analogues pour Fe a révélé que, dans les mêmes conditions, le composé [Fe(tBu-MeAMD)2] conduit à des films contenant Fe, Fe4N ainsi qu’à des carbures Fe3C et Fe4C.Des bicouches de Cu et Al ont été déposées à partir des protocoles mis au point. Leur recuit post dépôt a été suivi in situ par diffraction de rayons X et par mesure de la résistance électrique. Il a permis de stabiliser des phases θ-Al2Cu, η-AlCu et, pour la première fois reportée dans la littérature, de la phase approximante γ-Al4Cu9. Il a été démontré que la technique MOCVD associée avec des recuits post dépôt est une méthode appropriée pour obtenir des films composés d’alliages intermétalliques. Des dépôts conformes de tels films peuvent ainsi être envisagés pour des nombreuses applications. / Films and coatings intermetallic phases and intermetallic compounds present proprieties and combination of proprieties which are just partially explored today. They carry potential solutions to confer multifunctionality for advanced materials needed by industries and become a source of disruption and innovation. This situation prevails for the Al-Cu-Fe, in which even the binary Al-based exhibit remarkable properties. While techniques of physical vapor deposition are most often used for the development of such films and metallic coatings, the use of processes of chemical vapor deposition from metallorganic precursors (MOCVD) lead to the treatment and functionalization of surfaces with complex geometry. The present work joins in this logic.It aims at the development of MOCVD processes of Al, Cu and Fe films. These processes must be compatible to constitute the base for the elaboration of complex protocols allowing the codeposition or the sequential deposition of these elements. The MOCVD of Al from dimethylethyl amine alane (DMEAA) was adapted to satisfy the constraints of codeposition to validate the experimental device. Used for the deposition of unary and binary films, to validate certain aspects mechanistic of the deposition and to illustrate the capacity of the technique to cover in a shape way surfaces of complex geometry. The protocol development allows to operate at pressure of 10 Torr, in a window of temperatures between 160 °C and 240 °C. The modeling of the process allows its optimization in these conditions, leading to films with uniform thickness. The disorderly microstructure of these films is improved by a plasma pretreatment of the substrate of 304L steel in situ before deposition. The need to use precursors of Cu and Fe-free oxygen (for a co-deposition with Al) has led to testing for these two elements the original family of molecular compounds based ligands AMIDINATES. It is shown that pure Cu films are obtained between 200 ° C and 350 ° C from [Cu (i-Pr-Me-AMD)]2 in a gaseous phase rich in hydrogen, the boundary between the kinetic schemes and diffusion regyme being at 240 ° C. Screening similar to Fe precursors revealed that, under the same conditions, the compound [Fe (tBu-MeAMD)2] leads to films containing Fe, as well as Fe4N carbides Fe3C and Fe4C. Bilayers of Cu and Al were deposited from the protocols developed. Their post deposition annealing was followed by in situ X-ray diffraction and by measuring the electrical resistance. It has stabilized θ-Al2Cu, η-AlCu phases and, for the first time reported in the literature, the approximant phase γ-Al4Cu9. It was demonstrated that the MOCVD technique associated with post-deposition annealing is a suitable method to obtain films composed of intermetallic alloys. Deposits conform such films can thus be considered for many applications.

Nous avons étudié les transitions de phases structurales dans une série d'approximant 1/1 de quasicristaux de type CdYb. Les approximants 1/1 partagent le même environnement local que les quasicristaux, mais sont périodiquement ordonnés. L'approximant 1/1 Cd6Tb est particulièrement intéressant puisqu'il présente un ordre magnétique à longue distance en dessous de 20K. Une transition structurale est observée à Tc=192K. Nous avons déterminé la structure atomique de la phase cubique haute température ainsi que celle de la phase monoclinique observée en dessous de Tc. La dépendance en température de la mise en ordre du tétraèdre central a été étudiée en détail entre 192 et 180K. La distorsion de l'icosaèdre Tb12 joue certainement un rôle important dans la formation de l'ordre magnétique à longue distance. Nous avons confirmé que la transition de phase dans Cd6Yb n'est pas de type [110] mais de type [111] avec un groupe d'espace de la phase basse température P2/m. De plus l'influence de l'ordre chimique sur la transition a été étudié sur Cd6Pr and (Cd-Mg)6Pr avec 10% at. Mg. Dans ces deux cas la mise en ordre se fait le long de la direction [110]. Des simulations de dynamique moléculaire ont été conduite en utilisant des potentiels de pairs oscillant pour les phases approximantes Zn6Sc 1/1, Zn85.12Sc14.88 5/3, et Zn85.16Sc14.84 8/5. Le système Zn-Sc est isostructural au système Cd-Yb et les approximant 5/3 et 8/5 ont une maille suffisamment grande pour simuler un quasicrystal de manière réaliste. Dans les trois systèmes nous avons simulés les diagrammes de diffusion diffuse pour une température comprise entre 500 et 100K. Dans l'approximant 1/1 Zn6Sc l'évolution du signal de diffusion diffuse est en accord avec une augmentation de l'ordre à courte distance lorsque la température diminue. La comparaison de la diffusion diffuse entre l'approximant 1/1 et l'approximant 5/3 montre clairement un excès de diffusion diffuse pour l'approximant 5/3 qui est interprété comme résultant des fluctuations de phasons. Dans les trois approximants nous avons mis en évidence un phénomène de diffusion atomique entre le tétraèdre et le dodécaèdre. Pour l'approximant 1/1 cette diffusion se produit le long des diagonales de la maille cubique avec une énergie d'activation de l'ordre de 0.1 eV. Les simulations sur les approximants 5/3 et 8/5 ont montré que la dynamique du tétraèdre et la diffusion atomique dépendent de la complexité de la structure. Cette étude monte que la structure des amas atomiques et leur environnement local jouent certainement un rôle important pour les mécanismes de stabilisation de ces phases. / We have studied the structural phase transitions occurring in a series of periodic 1/1 approximant to the CdYb type quasicrystals. 1/1 approximants share the same local environment as the parent quasicrystal, yet with a periodic long range order. The Cd6Tb 1/1 approximant is of particular interest owing to its long range magnetic order observed below 20K. A structural phase transition is observed at Tc= 192K. The atomic structures of the high temperature cubic phase and the low temperature monoclinic phase has been determined. The temperature dependence of the central tetrahedron ordering and its connection to the phase transition has been studied in details between 192 and 180K. The distortion of the Tb12 icosahedron resulting from the ordering of the tetrahedron at low temperature is supposed to play a crucial role in the formation of the long range magnetic order. Diffuse scattering, characteristic of a short range order has also been observed above Tc. For the Cd6Yb approximant we have confirmed that the phase transition does not correspond to an ordering along [11 ̅0]. The space group of the low temperature phase is proposed as P2/m. Furthermore, the effects of chemical order on the ordering mechanism of the tetrahedra are investigated on Cd6Pr and (Cd-Mg)6Pr with 10% at. Mg. The ordering scheme of both Cd6Pr and (Cd-Mg)6Pr is of the [110] type instead of the previously claimed [111] type. Molecular dynamic simulations are carried out on the Zn6Sc 1/1, Zn85.12Sc14.88 5/3, and Zn85.16Sc14.84 8/5 approximants using an effective oscillating pair potential. The Zn-Sc system is isostructural to the Cd-Yb one and the 5/3 and 8/5 approximant have a unit cell large enough to mimic a real quasicrystal. In the three systems we have simulated the diffraction pattern as the temperature goes from 500K to 100K. In the Zn6Sc 1/1 approximant, the temperature dependence of the simulated diffuse scattering evidenced a short range order forming in the low temperature phase. It most likely correspond to the pretransitional short range order as observed experimentally. The comparison of the simulated diffuse scattering between the 1/1 and 5/3 approximants demonstrates an excess of diffuse scattering in the latter phase which is likely the contribution from phasons modes. We have evidenced an atomic diffusion taking place between tetrahedra and dodecahedra in all three approximants. The long range atomic diffusion in the 1/1 approximant is only observed along space diagonal directions of the cubic cell, with an activation energy of 0.1 eV. Further investigation on the 5/3 and 8/5 approximants have shown that the orientational dynamics of the central tetrahedra as well as the atomic diffusion are dependent on the complexity of the structures. The configuration of the clusters and their local environment are considered to play a crucial role in the stabilization mechanism of the quasicrystals and their periodic approximants.

Nous avons étudié les transitions de phases structurales dans une série d'approximant 1/1 de quasicristaux de type CdYb. Les approximants 1/1 partagent le même environnement local que les quasicristaux, mais sont périodiquement ordonnés. L'approximant 1/1 Cd6Tb est particulièrement intéressant puisqu'il présente un ordre magnétique à longue distance en dessous de 20K. Une transition structurale est observée à Tc=192K. Nous avons déterminé la structure atomique de la phase cubique haute température ainsi que celle de la phase monoclinique observée en dessous de Tc. La dépendance en température de la mise en ordre du tétraèdre central a été étudiée en détail entre 192 et 180K. La distorsion de l'icosaèdre Tb12 joue certainement un rôle important dans la formation de l'ordre magnétique à longue distance. Nous avons confirmé que la transition de phase dans Cd6Yb n'est pas de type [110] mais de type [111] avec un groupe d'espace de la phase basse température P2/m. De plus l'influence de l'ordre chimique sur la transition a été étudié sur Cd6Pr and (Cd-Mg)6Pr avec 10% at. Mg. Dans ces deux cas la mise en ordre se fait le long de la direction [110]. Des simulations de dynamique moléculaire ont été conduite en utilisant des potentiels de pairs oscillant pour les phases approximantes Zn6Sc 1/1, Zn85.12Sc14.88 5/3, et Zn85.16Sc14.84 8/5. Le système Zn-Sc est isostructural au système Cd-Yb et les approximant 5/3 et 8/5 ont une maille suffisamment grande pour simuler un quasicrystal de manière réaliste. Dans les trois systèmes nous avons simulés les diagrammes de diffusion diffuse pour une température comprise entre 500 et 100K. Dans l'approximant 1/1 Zn6Sc l'évolution du signal de diffusion diffuse est en accord avec une augmentation de l'ordre à courte distance lorsque la température diminue. La comparaison de la diffusion diffuse entre l'approximant 1/1 et l'approximant 5/3 montre clairement un excès de diffusion diffuse pour l'approximant 5/3 qui est interprété comme résultant des fluctuations de phasons. Dans les trois approximants nous avons mis en évidence un phénomène de diffusion atomique entre le tétraèdre et le dodécaèdre. Pour l'approximant 1/1 cette diffusion se produit le long des diagonales de la maille cubique avec une énergie d'activation de l'ordre de 0.1 eV. Les simulations sur les approximants 5/3 et 8/5 ont montré que la dynamique du tétraèdre et la diffusion atomique dépendent de la complexité de la structure. Cette étude monte que la structure des amas atomiques et leur environnement local jouent certainement un rôle important pour les mécanismes de stabilisation de ces phases. / We have studied the structural phase transitions occurring in a series of periodic 1/1 approximant to the CdYb type quasicrystals. 1/1 approximants share the same local environment as the parent quasicrystal, yet with a periodic long range order. The Cd6Tb 1/1 approximant is of particular interest owing to its long range magnetic order observed below 20K. A structural phase transition is observed at Tc= 192K. The atomic structures of the high temperature cubic phase and the low temperature monoclinic phase has been determined. The temperature dependence of the central tetrahedron ordering and its connection to the phase transition has been studied in details between 192 and 180K. The distortion of the Tb12 icosahedron resulting from the ordering of the tetrahedron at low temperature is supposed to play a crucial role in the formation of the long range magnetic order. Diffuse scattering, characteristic of a short range order has also been observed above Tc. For the Cd6Yb approximant we have confirmed that the phase transition does not correspond to an ordering along [11 ̅0]. The space group of the low temperature phase is proposed as P2/m. Furthermore, the effects of chemical order on the ordering mechanism of the tetrahedra are investigated on Cd6Pr and (Cd-Mg)6Pr with 10% at. Mg. The ordering scheme of both Cd6Pr and (Cd-Mg)6Pr is of the [110] type instead of the previously claimed [111] type. Molecular dynamic simulations are carried out on the Zn6Sc 1/1, Zn85.12Sc14.88 5/3, and Zn85.16Sc14.84 8/5 approximants using an effective oscillating pair potential. The Zn-Sc system is isostructural to the Cd-Yb one and the 5/3 and 8/5 approximant have a unit cell large enough to mimic a real quasicrystal. In the three systems we have simulated the diffraction pattern as the temperature goes from 500K to 100K. In the Zn6Sc 1/1 approximant, the temperature dependence of the simulated diffuse scattering evidenced a short range order forming in the low temperature phase. It most likely correspond to the pretransitional short range order as observed experimentally. The comparison of the simulated diffuse scattering between the 1/1 and 5/3 approximants demonstrates an excess of diffuse scattering in the latter phase which is likely the contribution from phasons modes. We have evidenced an atomic diffusion taking place between tetrahedra and dodecahedra in all three approximants. The long range atomic diffusion in the 1/1 approximant is only observed along space diagonal directions of the cubic cell, with an activation energy of 0.1 eV. Further investigation on the 5/3 and 8/5 approximants have shown that the orientational dynamics of the central tetrahedra as well as the atomic diffusion are dependent on the complexity of the structures. The configuration of the clusters and their local environment are considered to play a crucial role in the stabilization mechanism of the quasicrystals and their periodic approximants.

In this work, we demonstrate that the Leray-Schauder topological degree theory can be used for the development of a topological degree theory for maximal monotone perturbations of demicontinuous operators of type (S+) in separable reflexive Banach spaces. This is an extension of Berkovits’ degree development for operators as the perturbations above. Berkovits has developed a topological degree for demicontinuous mappings of type (S+), and has shown that the degree mapping is unique under the assumption that it satisfies certain general properties. He proved that if f is a bounded demicontinous mapping of type (S+), G is an open bounded subset of X, and 0 ∈/ f(∂G), then there exists ε0 > 0 such that for every ε ∈ (0, ε0) we have 0 ∈/ (I+ (1/ε)QQ∗ (f))(∂G). Here, Q is a compact linear injection from a Hilbert space H into X, such that Q(H) is dense in X, and Q∗ its adjoint. The map I+ 1 εQQ∗ (f) is a compact displacement of the identity, for which the Leray-Schauder degree is well defined. The Berkovits degree is obtained as the limit of this Leray-Schauder degree as ε tends to zero. We utilize a demicontinuous (S+)-approximation of the form Tt + f, where Tt is the Yosida approximant of T. Namely, we show that if G is an open bounded set in X and 0 ∈/ (T + f)(∂G), then there exist ε0 > 0, t0 > 0, such that for every ε ∈ (0, ε0), t ∈ (0, t0), we have 0 ∈/ (I + (1/ε)QQ∗ (Tt + f))(∂G). Our degree is the limit of the Leray-Schauder degree of the compact displacement of the identity I + (1/ε)QQ∗ (Tt + f) as ε, t → 0. Various extension of the degree has been considered. Finally some properties and applications in invariance of domain, eigenvalue and surjectivity results have also been discussed.

Quasicrystals is a new kind of material that have several interesting aspects to it. The unusual atomic structure entails many anomalous and unique physical properties, for example, high hardness, and extremely low electrical and thermal conductivity. In thin films quasicrystals would enable new functional materials with a combination of attractive properties.In this work, AlCuFe and Nanoflex steel, materials that are known to form quasicrystals in bulk, have been deposited as thin films on Si and Al2O3 substrates using DC magnetron sputtering. These thin films were heat treated, and the formation and growth of different phases, among other approximant and quasicrystalline phases, were studied using mainly in-situ X-ray diffraction.During the project several problems with the formation of quasicrystals were encountered, and it is proposed how to overcome these problems, or even how to make use of them. Finally, the quasicrystalline phase was realized, although it was not completely pure. In the end some suggestions for future work is presented.

<p>Quasicrystals is a new kind of material that have several interesting aspects to it. The unusual atomic structure entails many anomalous and unique physical properties, for example, high hardness, and extremely low electrical and thermal conductivity. In thin films quasicrystals would enable new functional materials with a combination of attractive properties.In this work, AlCuFe and Nanoflex steel, materials that are known to form quasicrystals in bulk, have been deposited as thin films on Si and Al2O3 substrates using DC magnetron sputtering. These thin films were heat treated, and the formation and growth of different phases, among other approximant and quasicrystalline phases, were studied using mainly in-situ X-ray diffraction.During the project several problems with the formation of quasicrystals were encountered, and it is proposed how to overcome these problems, or even how to make use of them. Finally, the quasicrystalline phase was realized, although it was not completely pure. In the end some suggestions for future work is presented.</p>

Le présent travail de thèse se propose de profiter de la description cristallographique à N dimensions pour rediscuter les structures des alliages métalliques périodiques dont les atomes sont situés sur un sous-ensemble ordonné d’un Z-module — c’est-à-dire sur des positions qui sont des combinaisons linéaires entières de N>3 vecteurs arithmétiquement indépendants— exemplifiés par les quasicristaux et les phases approximantes. La description cristallographique à N dimensions permet ainsi de révéler des symétries supplémentaires, cachées dans l’espace physique, susceptibles d’engendrer de nouveaux types de défauts, dits défauts de module, dans les alliages métalliques périodiques dont les atomes se localisent sur un Z-module non trivial dans l’espace direct. Ces défauts correspondent aux opérations de symétrie interne du Z-module qui sont perdues lors de la projection rationnelle dans l’espace physique en raison de la périodicité de l’alliage. Ce sont des macles, des défauts de translations et les dislocations qui les bordent et que nous désignons par dislocations de modules pour les différencier des usuelles dislocations de réseau. Elles apparaissent comme des dislocations partielles bordant une ou plusieurs fautes d’empilement. Des dislocations particulières peuvent exister avec des vecteurs de Burgers ayant une composante nulle dans l’espace physique. Ces dislocations, que nous appelons dislocations scalaires, n’engendrent aucun champ de contrainte et ne sont sensibles à aucun champ de déformation. La phase orthorhombique NiZr de symétrie Cmcm a une maille cristalline dont tous les atomes sont situés sur une fraction d’un même Z-module pentagonal ; elle, est à ce titre, parfaitement descriptible à 5 dimensions. A parti de cette analyse, nous avons prédit l’existence de nouveaux défauts tels que les macles quinaires et défauts de translations, tous observés et confirmés par nos observations en microscopie électronique haute résolution HREM et STEM-HAADF. / The present work is an attempt to take advantage of the N-dimensional crystallographic description to rediscuss the structures of periodic metal alloys whose atoms are located on an ordered subset of a Z-module — positions that are integer linear combinations of N> 3 arithmetically independent vectors — like those encountered in quasicrystals and approximants. This N-dimensional crystallographic description makes it possible to reveal hidden symmetries in periodic metallic alloys, that can generate new types of possible defects by symmetry breaking during the projection in the physical space. Thus, in addition to the usual defects due to a local breaking of periodicity, these alloys may contain new defects corresponding to internal symmetry operations of the Z-module which are lost due to the periodicity of the alloy. These defects are twins, translation defects and dislocations that border them and that we refer to as dislocations of modules to differentiate them from the usual network dislocations and which appear as partial dislocations bordering one or more stacking faults. Particular dislocations may exist with Burgers vectors having a null component in the physical space. These dislocations, which we call scalar dislocations, generate no stress field and are not sensitive to any deformation field. The orthorhombic phase of NiZr has a crystal structure the atoms of which are located on a fraction of the pentagonal Z-module and is therefore fully describable at 5 dimensions. We can thus describe new defects such as quinary twins, but also defects of translations that all keep the Z-module invariant. All these defects have indeed been observed and recognized by high resolution electron microscopy (HREM and STEM-HAADF).

Description de mes activités de recherche réalisées depuis plus de 20 ans.

Submitted by Aline Batista (alinehb.ufpel@gmail.com) on 2016-06-29T19:34:38Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) A dinâmica dos gestos articulatórios da líquida lateral palatal.pdf: 6446781 bytes, checksum: 47d086436a73ebb11f6b2217fdbf858d (MD5) / Approved for entry into archive by Aline Batista (alinehb.ufpel@gmail.com) on 2016-06-30T20:24:48Z (GMT) No. of bitstreams: 2 A dinâmica dos gestos articulatórios da líquida lateral palatal.pdf: 6446781 bytes, checksum: 47d086436a73ebb11f6b2217fdbf858d (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2016-06-30T20:25:05Z (GMT). No. of bitstreams: 2 A dinâmica dos gestos articulatórios da líquida lateral palatal.pdf: 6446781 bytes, checksum: 47d086436a73ebb11f6b2217fdbf858d (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2016-06-06 / Sem bolsa / Devido as suas características linguísticas, articulatórias e acústicas, as laterais são concebidas como sons complexos. Promovem curiosidades, dúvidas e controvérsias (LADEFOGED, 1986; SILVA, 1996 e ALBANO, 2001) no meio acadêmico, mas são pouco investigadas. De fato, descrições da consoante líquida lateral palatal, por exemplo, ainda são escassas no Português Brasileiro (PB), sobretudo em populações atípicas. A presente pesquisa tem por objetivo a investigação da produção dessa consoante por usuários de implante coclear e por adultos falantes do português brasileiro como língua materna. As análises foram guiadas pela Fonologia Gestual, que concebe a fonologia das línguas como um sistema dinâmico. Foram analisadas as produções orais de 10 sujeitos adultos com idades entre 20 e 25 anos – 5 do gênero masculino e 5 do gênero feminino – e de uma usuária de implante coclear, de 13 anos. Os dados foram gravados por meio de um gravador digital, modelo Zoom H4N sincronizado a um ultrassom, modelo Mindray DP-6600. As coletas ocorreram em duas etapas. Na primeira, imagens foram apresentadas na tela de um computador, as quais deveriam ser nomeadas e inseridas na frase veículo Digo (palavra) bem bonito. Na segunda, o mesmo procedimento foi realizado com logatomas. A totalidade do corpus é de 3.420 itens. Os dados acústicos foram analisados por meio do software Praat, versão 5.3.77 (BOERSMA & WEENINK, 2007), e os dados articulatórios por meio do Software AAA (WRENCH, 2012). Os dados foram submetidos, ainda, à análise estatística através do software SPSS Statistics. Os resultados foram ao encontro dos obtidos por Silva (1996): Identificou-se as três fases acústico-articulatórias da consoante [?] quanto à trajetória dos formantes, bem como sua palatalização. Tais fatos acústicos demonstraram possuir correlatos com as imagens ultrassonográficas obtidas. A informante usuária de implante coclear realizou a consoante mais lentamente do que os informantes ouvintes, mas os aspectos acústicos de suas produções são semelhantes aos desses informantes. Entretanto, ao analisar os dados articulatórios, detectou-se uma variabilidade na palatalização da consoante, fato não detectado para os ouvintes. / Due to their linguistic, articulatory and acoustic characteristics, the lateral consonants are conceived as complex sounds. They promote curiosities, doubts and controversies (Ladefoged, 1986; SILVA, 1996 and ALBANO, 2001) in the academia, but it is scarcely investigated. In fact, descriptions of the palatal lateral approximant consonant, for example, are still rare in Brazilian Portuguese (BP), especially in atypical populations. This research aims to investigate the production of this consonant by people who received cochlear implant and adult speakers of Brazilian Portuguese as their mother tongue. The analysis was guided by the Gestual Phonology that conceives the phonology of the languages as a dynamic system. Ten adult subjects with ages between 20 and 25 years - 5 males and 5 females - and one female user of cochlear implant with the age 13 years had their oral production analyzed. The data were recorded by a digital recorder Zoom H4N model synchronized to an ultrasound, Mindray DP-6600 model. The samples were collected in two stages. First, images were displayed on a computer screen, whose names should be inserted in the gap of the vehicle phrase Digo (word) bem bonito – I say (…) pretty well. In the second, the same procedure was performed with logatomas. The totality of the corpus is of 3,420 items. The acoustic data were analyzed by Praat software version 3.5.77 (BOERSMA & Weenink, 2007), and for the articulatory data was used AAA Software (WRENCH, 2012). The data were also submitted to statistical analysis using SPSS software. The results agree with those obtained by Silva (1996), it means: the three acoustic-articulatory phases of the consonant [x] were identified regarding the trajectory of the formants, as well as palatalization. Such acoustic facts demonstrate correlations with the obtained ultrasound images. The informant with cochlear implant articulated the consonant more slowly than listeners, but the acoustic aspects of her productions are similar to those informants. However, when we analyze the articulatory data it was detected a variability in palatalization of the consonant, a fact that was not detected for the listeners.