PbTiO3铁电相及顺电相的声子色散理论计算
PbTiO3철전상급순전상적성자색산이론계산
THE THEORETICAL CALCULATION ABOUT PHONON DISPERSION OF THE TETRAGONAL AND CUBIC PHASES IN PbTiO3
  • 万方数据
    物理学报 물이학보

    2001年 2期 239-243 ,共5页

    刘平%徐文兰%李志锋%缪中林%陆卫

    류평%서문란%리지봉%무중림%륙위

    PbTiO3%刚性离子模型%Born-Mayer势%声子色散 PbTiO3%剛性離子模型%Born-Mayer勢%聲子色散
    PbTiO3%강성리자모형%Born-Mayer세%성자색산
    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.
    용통일적、삼수물리의의명학적강성리자모형연구료철전체PbTiO\-3철전상화순전상적성자색산관계화포리연구중심유관상변적진동모，용비이왕계산소득다적삼수득도료비교호적결과，병제출료연구연모적간화모형구상.
    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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