| Stability of phases in （Ba,Gd）MnO3 solid solution system |
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| 引用本文： | Migaku Kobayashil,;Hidenori Tamura,;Hiromi Nakano,;Hirohisa Satoh,;Naoki Kamegashira. Stability of phases in （Ba,Gd）MnO3 solid solution system[J]. 中国稀土学报(英文版), 2008, 26(2): 233-236. DOI: 10.1016/S1002-0721(08)60071-X |
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| 作者姓名： | Migaku Kobayashil, Hidenori Tamura, Hiromi Nakano, Hirohisa Satoh, Naoki Kamegashira |
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| 作者单位： | [1]Department of Chemistry and Biochemistry, Numazu National College of Technology, 3600 Ooka, Numazu, Shizuoka 410-8501, Japan; [2]Electron Microscope Laboratory, Ryukoku University, Seta, Otsu 520-2194, Japan; [3]Department of Materials Science, Toyohashi University of Technology, Tempaku-cho, Toyohashi 441-8580 Japan |
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| 基金项目： | Project supported by the Grant-in-Aid for Scientific Research (C) (18560662) by the Japan Society for the Promotion of Science |
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| 摘 要： | The existing phases in BaxGd1-xMnO3 solid solution system （0≤x≤ 1） were studied by analyzing the detailed crystal structure of each composition from the results of the Rietveld method using powder X-ray diffraction data. For a small substitution of Ba for Gd （0≤x〈0. 1）, the orthorhombic phase with a perovskite type structure （Pnma space group） was stably formed and this fact was supported by the electron diffraction data. There existed an intermediate phase of Ba0.33Gd0.67MnO3, which was characterized as the tetragonal phase with perovskite structure. The composition range of this phase was narrow and almost line compound. Between the regions of these phases, there existed two-phase region. There was also a two-phase region between the intermediate tetragonal phase and BaMnO3. Measurement of electrical conductivities of these orthorhombic solid solutions and tetragonal phases showed semiconducting behaviors for both phases and the existence of the phase transition at high temperature for the orthorhombic phase, The transition temperature decreased as the Ba content increased.
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| 关 键 词： | 稀土 水锰矿 X线衍射 晶体结构 |
| 收稿时间： | 2007-08-10 |
| 修稿时间： | 2007-12-20 |
Stability of phases in (Ba, Gd)MnO3 solid solution system |
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| Migaku Kobayashi, Hidenori Tamura, Hiromi Nakano, Hirohisa Satoh,Naoki Kamegashira. Stability of phases in (Ba, Gd)MnO3 solid solution system[J]. Journal of Rare Earths, 2008, 26(2): 233-236. DOI: 10.1016/S1002-0721(08)60071-X |
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| Authors: | Migaku Kobayashi Hidenori Tamura Hiromi Nakano Hirohisa Satoh Naoki Kamegashira |
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| Affiliation: | [1]Department of Chemistry and Biochemistry, Numazu National College of Technology, 3600 Ooka, Numazu, Shizuoka 410-8501, Japan [2]Electron Microscope Laboratory, Ryukoku University, Seta, Otsu 520-2194, Japan [3]Department of Materials Science, Toyohashi University of Technology, Tempaku-cho, Toyohashi 441-8580 Japan |
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| Abstract: | The existing phases in BaxGd1-xMnO3 solid solution system (0≦x≦1) were studied by analyzing the detailed crystal structure of each composition from the results of the Rietveld method using powder X-ray diffraction data. For a small substitution of Ba for Gd (0≦x<0.1), the orthorhombic phase with a perovskite type structure (Pnma space group) was stably formed and this fact was supported by the electron diffraction data. There existed an intermediate phase of Ba0.33Gd0.67MnO3, which was characterized as the tetragonal phase with perovskite structure. The composition range of this phase was narrow and almost line compound. Between the regions of these phases, there existed two-phase region. There was also a two-phase region between the intermediate tetragonal phase and BaMnO3. Measurement of electrical conductivities of these orthorhombic solid solutions and tetragonal phases showed semiconducting behaviors for both phases and the existence of the phase transition at high temperature for the orthorhombic phase. The transition temperature decreased as the Ba content increased. |
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| Keywords: | rare earth manganite phase behavior X-ray diffractometry crystal structure electrical conductivity |
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