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

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.

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

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.

Thesis (M.S.)--University of North Carolina at Wilmington, 2006. / Includes bibliographical references (leaves: 52-55)

Thesis (Ph. D.)--University of Queensland, 2001. / Includes bibliographical references.

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.

Thesis (M. Phil.)--University of Hong Kong, 1974.

Thesis (Ph. D.)--University of Hong Kong, 1989.

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