Preparation and Electrical Properties of Sintered Bodies Composed of Monophase Spinel Mn_<(2-X)>Co_<2X>Ni_<(1-X)>O_4 (0 ≦ X ≦ 1) Derived from Rock-Salt-Type Oxides
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概要
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Preparation of spinel-type oxides, Mn_<(2-X)>Co_<2X>Ni_<(1-X)>O_4 (0 ≦ X ≦ 1), and their electrical properties were investigated. Die-pressed oxides (25 mm diam. × 4 mm), containing metals with desired molar ratios, were heated to 1400℃, and held at that temperature for 3 h in nitrogen. The sintered specimens were quenched to 800℃ and then oxidized for 95 h in air to completely convert them into spinel-type oxides. The lattice constants of the spinels decreased with increasing X. Two turning points, at X = 0.5 and 0.84, were observed. Based on these results, the cation distributions were estimated. Calculation of the Seebeck coefficient proved that the carriers of the oxides with X = 0 and 0.25 are electrons and those of the oxides with X = 0.5 to 1 are holes. Activation energies calculated from mobility were 0.34 to 0.36 eV. The conduction was considered to be due to the small polaron hopping mechanism.
- 社団法人応用物理学会の論文
- 1996-11-15
著者
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KOMEYA Katsutoshi
Yokohama National University
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MEGURO Takeshi
Yokohama National University
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SASAMOTO Tadashi
Kanagawa Institute of Technology, Department of Applied Chemistry
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Meguro Takeshi
Graduate School Of Environment And Information Sciences Yokohama National Univ.
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Meguro Takeshi
Graduate School Of Environment And Information Science Yokohama National University
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Komeya Katutoshi
Graduate School Of Environment And Information Science Yokohama National University
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Meguro Takeshi
Department Of Artificial Environment And Information Faculty Of Environment And Information Sciences
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Kondo Kazuhiro
Fujitsu Laboratories Ltd.
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Kondo K
Fujitsu Laboratories Ltd.
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Yokoyama Toshifumi
Storage Media Systems Development Center Matsushita Electric Industrial Co. Ltd.
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Yokoyama T
Storage Media Systems Development Center Matsushita Electric Industrial Co. Ltd.
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Kondo Kazuyuki
Yokohama National University
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SASAMOTO Tadashi
Department of Applied Chemistry, Kanagawa Institute of Technology
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Abe Yoshiaki
Technol Seven Co. Ltd.
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YOKOYAMA Takashi
Yokohama National University
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Kaneko Shinobu
Yokohama National University
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Sasamoto T
Kanagawa Inst. Technol Atsugi Jpn
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Yokoyama T
Tokai Univ. Kanagawa Jpn
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Sasamoto Tadashi
Kanagawa Institute Of Technology
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Meguro Takeshi
Graduate School and Research Institute of Environment and Information Sciences, Yokohama National University
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