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Using silver as a binder for synthesis of magnetoresistive lanthanum calcium manganese oxide =: 用银作粘合剂来合成镧钙锰氧磁致电阻材料. / 用银作粘合剂来合成镧钙锰氧磁致电阻材料 / Using silver as a binder for synthesis of magnetoresistive lanthanum calcium manganese oxide =: Yong yin zuo nian he ji lai he cheng lan gai meng yang ci zhi dian zu cai liao. / Yong yin zuo nian he ji lai he cheng lan gai meng yang ci zhi dian zu cai liaoJanuary 2000 (has links)
Zhou Lingzhao. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaves 84-85). / Text in English; abstracts in English and Chinese. / Zhou Lingzhao. / Chapter Chapter 1 --- Introduction / Chapter 1.1 --- Magnetoresistance effect --- p.1 / Chapter 1.2 --- Giant magnetoresistance (GMR) effect --- p.2 / Chapter 1.3 --- CMR effect in rare earth manganites --- p.2 / Chapter 1.4 --- Main research in this thesis --- p.5 / Chapter Chapter 2 --- Synthesis technology / Chapter 2.1 --- Conventional solid state reaction --- p.8 / Chapter 2.2 --- Powder preparation --- p.10 / Chapter 2.3 --- Shaping --- p.13 / Chapter 2.4 --- Sintering --- p.14 / Chapter 2.5 --- Fabrication method in this experiment --- p.20 / Chapter 2.6 --- Characterization method --- p.22 / Chapter Chapter 3 --- Stoichiometry problems in LCMO / Chapter 3.1 --- Doping effects in La2/3Ca1/3MnO3 --- p.24 / Chapter 3.2 --- La stoichiometry in La2/3Ca1/3MnO3 --- p.28 / Chapter 3.3 --- Mn stoichiometry in La2/3Ca1/3MnO3 --- p.28 / Chapter 3.4 --- Oxygen stoichiometry in La2/3Ca1/3MnO3 --- p.32 / Chapter Chapter 4 --- Search for binders in the synthesis of La2/3Ca1/3MnO3 / Chapter 4.1 --- Solid state reaction --- p.38 / Chapter 4.2 --- Density --- p.39 / Chapter 4.3 --- Crystal structure --- p.41 / Chapter 4.4 --- SEM analyses --- p.48 / Chapter 4.5 --- Resistivity and magnetoresistance --- p.54 / Chapter 4.6 --- Small polaron transport --- p.72 / Chapter 4.7 --- Conclusion --- p.81
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Oxygen effects in lanthanum calcium manganese oxide: 氧含量在鑭鈣錳氧化物中的作用. / CUHK electronic theses & dissertations collection / Oxygen effects in lanthanum calcium manganese oxide: Yang han liang zai lan gai meng yang hua wu zhong de zuo yong.January 1997 (has links)
by Yang, Fei. / Thesis (Ph.D.)--Chinese University of Hong Kong, 1997. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese. / by Yang, Fei.
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Transition metal and rare earth element fluxes at two sites in the eastern tropical Pacific : relationship to ferromanganese nodule genesisMurphy, Kim Marie 28 June 1984 (has links)
Transition metal and rare earth element (REE) data are presented
for various sedimentary materials from two Manganese Nodule
Program (MANOP) sites in the eastern tropical Pacific. These data
constrain the sources of elemental supply to the seafloor and the
processes that control ferromanganese nodule genesis. Investigation
of elemental partitioning between suspended particles, sediments,
ferromanganese nodules, crusts, and micronodules indicates that
particle settling dominates REE supply to the seafloor at MANOP site
H. Partitioning of the particle flux reveals that although detrital
and labile particles both convey REE to H sediments and nodules,
labile biogenic debris is the primary source of REE accreted by site
H nodules.
Evidence from REE abundance patterns and correlations of REE
with other elements define three basic processes of nodule accretion:
(1) hydrogenous or direct seawater precipitation; (2) oxic
diagenesis, referring to a variety of ferromanganese accretion processes
which occur in oxic sediments; and (3) suboxic diagenesis, in
which Mn is mobilized by the oxidation of sedimentary organic matter.
The REE geochemistry of site H nodules suggests an additional
accretionary process, resulting from the degradation of labile
organic matter in an oxic environment.
Contrasts in REE patterns, major element compositions, and
fluxes of various elements in sedimentary samples from MANOP site H
(a nodule-bearing site) with site M (a nodule-free site) reveal
differences in the sources of material to the seafloor in the two
environments. Geochemical data imply a greater hydrothermal influence
and a greater accumulation of organic carbon in site M sediments
relative to those at site H. Comparisons of the REE and major
element geochemistry of H and M sediment traps, sediments, and
crusts, as well as nodules from site H, imply that the reductive
mobilization of Mn and geochemically similar elements is controlled
primarily by surface water biological productivity and the accumulation
of organic carbon in the sediments. The organic flux to the
sediments determines the degree of depletion of oxidants, which
governs the reduction, mobilization, and supply of metals to nodule
surfaces. It appears that the depth to the Mn redox boundary and
possibly seasonal variations in the flux of organic material to the
seafloor determine whether nodules grow or whether Mn is exported to
bottom waters. / Graduation date: 1985
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Transport Studies of Lightly Electron-Doped Manganese OxidesChiorescu, Corneliu Daniel 20 April 2008 (has links)
A comprehensive study of transport properties of lightly electron-doped manganese oxides with perovskite structure is presented. Two similar classes are investigated in both their both paramagnetic and antiferromagnetically ordered states: Ca1-xLaxMnO3 and Ca1-ySryMnO3. Much simpler than their widely-studied hole-doped counterparts, these compounds are model systems for investigating the issue of magnetic polaron formation in perovskite manganites. Our measurements sustain the phase segregation scenario both above and below the magnetic ordering temperature in Ca1-xLaxMnO3, but it is found that for T>Tn, the small-polaron theory (successful in describing the colossal magnetoresistance compounds) is incompatible with our results and a large polaron theory should be used instead. Particularly interesting are the nominally undoped, semiconducting Ca1-ySryMnO3 compounds with a very small electron concentration associated with native oxygen vacancies. At low temperatures, electron bound near vacancies are mobilized in weak applied electric field (F<100 V/cm). This internal current source allows for a distinction between self-trapped and bound magnetic polarons and provides a new tool for studying strongly correlated electron systems with a tunable mobile carrier density.
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Manganese concentration and speciation in coastal rainwater, southeastern North Carolina /Inscore, Michael Todd. January 2006 (has links)
Thesis (M.S.)--University of North Carolina at Wilmington, 2006. / Includes bibliographical references (leaves: 52-55)
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Manganese analysis and speciation in freshwater lakes and reservoirs /Gipey, Collins D. January 2001 (has links) (PDF)
Thesis (Ph. D.)--University of Queensland, 2001. / Includes bibliographical references.
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Numerical studies of manganite modelsBurgy, Jan. Dagotto, Elbio, January 2003 (has links)
Thesis (Ph. D.)--Florida State University, 2003. / Advisor:Dr. Elbio Dagotto, Florida State University, College of Arts and Sciences, Dept. of Physics. Title and description from dissertation home page (viewed Sept. 29, 2003). Includes bibliographical references.
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The structural and electrical properties of manganese telluride.Chung, Wing-hin, Tom. January 1974 (has links)
Thesis (M. Phil.)--University of Hong Kong, 1974.
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Oxidation chemistry of ruthenium and manganese complexes of multi-anionic chelating ligands /Leung, Wa-hung. January 1989 (has links)
Thesis (Ph. D.)--University of Hong Kong, 1989.
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Characterization of manganese-oxide perovskites, exhibiting a colossal magnetoresistanceLiu, Guoliang 28 August 2008 (has links)
Not available / text
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