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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Observations on the rare earths

Engle, Edgar Wallace. January 1900 (has links)
Thesis (Ph. D.)--University of Illinois, 1916. / Vita.
12

Geochemical modeling of the distribution of rare-earth and other elements in a basalt and grain-size fraction of soils from the Apollo 17 valley floor and a well-tested procedure for accurate instrumental neutron activation analysis of geologic materials

Korotev, Randall Lee, January 1976 (has links)
Thesis--Wisconsin. / Vita. Includes bibliographical references (leaves 250-264).
13

Compostos de adicao entre perrenatos de itrio e lantanideos (III) e o tetrametilenossulfoxido

UMEDA, KIYOE 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:24:33Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:04:15Z (GMT). No. of bitstreams: 1 01016.pdf: 1518760 bytes, checksum: a117f4ab0fdcbef2dc012c5fd0a73174 (MD5) / Tese (Doutoramento) / IEA/T / Instituto de Quimica, Universidade de Sao Paulo - IQ/USP
14

Compostos de adicao entre perrenatos de itrio e lantanideos (III) e o tetrametilenossulfoxido

UMEDA, KIYOE 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:24:33Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:04:15Z (GMT). No. of bitstreams: 1 01016.pdf: 1518760 bytes, checksum: a117f4ab0fdcbef2dc012c5fd0a73174 (MD5) / Tese (Doutoramento) / IEA/T / Instituto de Quimica, Universidade de Sao Paulo - IQ/USP
15

A comparison of the efficiencies of bromates and nitrates in the separation of the rare earth elements from one another

Wylie, Dorothy Elinore January 1933 (has links)
[No abstract available] / Science, Faculty of / Chemistry, Department of / Graduate
16

Studies on the rare earths

Shaw, Kenneth Noel Francis January 1942 (has links)
[No abstract submitted] / Science, Faculty of / Chemistry, Department of / Graduate
17

Studies in the rare earths. The fractional crystallization of the rare earth double magnesium nitrates. The preparation and fractional crystallization of the rare earth bromates

Taylor, Arthur E. January 1946 (has links)
Analysis of the Basic Residues from a series of rare earth double magnesium nitrates indicated the possibility of the presence of II in the material. A new method of preparation of rare earth bromates proposed by Moeller & Kremers (18) was proved satisfactory. / Science, Faculty of / Chemistry, Department of / Graduate
18

A new method for the preparation of rare earth bromates

Robertson, Robert Frank Struan January 1948 (has links)
The preparation of the oxides of the cerium and yttrium sub-groups is discussed, and a new method is proposed for the preparation of rare earth bromates, involving the use of calcium bromate instead of barium bromate. The solubility of calcium bromate was measured roughly, and was found to be 102.5 gms per 100 ml of saturated solution at 19°C. / Science, Faculty of / Chemistry, Department of / Graduate
19

Studies concerning the chemistry of rare earth elements in organic environments

Crease, Allan Edward January 1973 (has links)
The infrared and proton magnetic resonance spectra of a number of compounds containing sites of Lewis basicity change in the presence of selected cyclopentadienyllanthanides, R3Ln. These spectral changes indicate that the lanthanide derivatives can act as Lewis acids towards bases such as bridging and terminal carbonyl ligands, terminal nitrosyl ligands, appropriate transition metals and a carbon-carbon triple bond. Several solid adducts can be isolated and characterized. The preparation of the new compounds R2LnM(_5-Cp)(C0)3 [Ln = Dy, Ho, Er or Yb; M = Mo or W] is described, and evidence for the existence of isocarbonyl linkages in these complexes is presented. As a synthetic route to compounds containing apparent lanthanide-transition element bonds, the direct reaction of elemental metals with transition metal organometal1ics is studied. Finely divided lanthanide and other metals react with substrates such as Mn(C0)5Br, (3-C3H5)Fe(C0)3I, [(5-Cp)Mo(C0)3]2 and (5-Cp)Cr(C0)3HgCl in THF to yield extremely reactive, air- and moisture-sensitive solutions. Some of the chemistry of these solutions and other synthetic approaches to them are outlined. The versatility of these solutions as reactive intermediates during the preparation of organometallic compounds is described. / Arts, Faculty of / Philosophy, Department of / Graduate
20

Comparison of hexagonal close packed and cubic close packed rare gas solids

Hurst, Michael James January 1975 (has links)
Hexagonal close packed and cubic close packed structures of heavy rare gas atoms are compared. Lattice expansion effects are examined for a model in which atoms interact via Lennard-Jones (12-6) potentials, lattice motion is according to the quasiharmonic approximation, and the model crystals are in equilibrium at constant temperature and pressure. Phonon frequencies are found to depend sensitively upon lattice parameters. In the cubic (hexagonal) structure the phonon modes most strongly affected by expansion are long (short) wavelength, longitudinal (transverse), acoustic (optic) modes. Phonon frequencies for the cubic structure all remain real for expansions considerably greater than would cause imaginary frequencies for the hexagonal structure. Equilibrium lattice parameters are found to deviate from their static equilibrium values by amounts depending upon the De Boer parameter, the deviations being slightly greater for the hexagonal structure, which exhibits nonideal stacking. The problem of explaining the observed stability of the cubic structures of real rare gas solids is discussed. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

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