Cation Distribution and Structural Instability in Bi4-xLaxTi3O12
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概要
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Raman spectra of Bi4-xLaxTi3O12 have been investigated. For an increasing degree of La doping, we find a substantial hardening of the vibration involving Bi atoms at the perovskite A site, whereas the Bi mode at the Bi2O2 layer is negligibly changed. From a comparison with a simple mass consideration, we identify a precise cation distribution, which indicates a pronounced site selectivity of La ions for the A site for $x<{\sim}\,1$. At room temperature, the lowest mode at 28 cm-1 shows a significant softening with La doping. This behavior resembles the temperature dependence in the nondoped material (at constant composition). A remarkable correlation is found between the soft-mode frequency and $T_{\text{C}}$ for Bi4-xLaxTi3O12. We suggest that this correlation, as well as the soft-mode frequency for substituted materials, offers useful guidelines for designing materials in a controlled manner.
- INSTITUTE OF PURE AND APPLIED PHYSICSの論文
- 2001-09-30
著者
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Osada Minoru
Material And Structures Lab. Tokyo Inst. Tech.
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TADA Masaru
Materials and Structures Laboratory, Tokyo Institute of Technology
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Watanabe Takayuki
Department Of Biochemistry School Of Dentistry Hokkaido University
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Kakihana Masato
Materials & Structures Laboratory Tokyo Institute Of Technology
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Funakubo Hiroshi
Department of Innovative and Engineered Material, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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Osada Minoru
Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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