PbTiO3铁电相及顺电相的声子色散理论计算
THE THEORETICAL CALCULATION ABOUT PHONON DISPERSION OF THE TETRAGONAL AND CUBIC PHASES IN PbTiO3
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摘要: 用统一的、参数物理意义明确的刚性离子模型研究了铁电体PbTiO\-3铁电相和顺电相的声子色散关系和布里渊区中心有关相变的振动模,用比以往计算少得多的参数得到了比较好的结果,并提出了研究软模的简化模型构想.
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关键词:
- PbTiO3 /
- 刚性离子模型 /
- Born-Mayer势 /
- 声子色散
Abstract: The rigid-ion model with only eight or nine meaningful parameters is applied to calculate the dispersion relations of both ferroelectric and paraelectric phases in PbTiO3. Phonon frequencies and vibration mode at the zone center were obtained. The good agreement between our calculation and the previously mode with eighteen parameters is shown. A simple model for investigation of the soft modes is suggested. -
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