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合成了ＬａxＢｉ2-xＴｉ4Ｏ11系列样品，并完成了它们的喇曼光谱和ｘ射线衍射测量；结果表明，该体系在Ｘ＝１．２经历了一次相变，且相变与最低频声子模随Ｘ的变化有关。Ｌａ0.2Ｂｉ1.8·Ｔｉ4Ｏ11的相变温度为２００℃。初步获得Ｌａ2Ｔｉ4Ｏ11的结构为正交结构。The system LaxBi2-xTi4O11 has been synthesised, their Raman spectra and powder X ray diffraction pattern as well as the high temperature Raman spectra of Ｌａ0.2Ｂｉ1.8Ｔｉ4Ｏ11 have been measured. The results show that the phase transition at x=1.2 occurring in LaxBi2-xTi4O11 is correlated with the lowest frequency phonon mode. The Phase transition temperature of Ｌａ0.2Ｂｉ1.8Ｔｉ4Ｏ11 is 200℃. The structure of La2Ti4O11 can be considered as an orthorhombic one.
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