Crystal Structure Refinement of La0.683(Ti0.95Al0.05)O3 Perovskite by the Rietveld Method |
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| Authors: | Roushown Ali Masatomo Yashima Masahiro Yoshimura Hideki Yoshioka |
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| Affiliation: | Department of Materials Science and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8502, Japan;Center for Materials Design, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan;Hyogo Prefectural Institute of Industrial Research, Suma, Kobe 654-0037, Japan |
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| Abstract: | The structural parameters of orthorhombic and tetragonal phases (space group P / mmm and P 4/ mmm ) of A-site deficient La0.683(Ti0.95Al0.05)O3 perovskite have been refined by Rietveld analysis through the X-ray powder diffraction patterns measured in the temperature range from 15° to 500°C. With an increase in temperature the unit-cell parameters a , b , and c increased, while the b / a ratio decreased and became unity between 200° and 400°C. No significant changes were observed for atomic coordinates throughout the temperature studied. These results strongly suggest that the phase transition is induced by lattice distortion. |
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| Keywords: | crystals/crystallization perovskites lanthanum/lanthanum compounds |
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