La＿xBi＿（2－X）Ti＿4O＿11的合成及相变研究  

STUDY ON THE SYNTHESIS AND PHASE TRANSITION OF La_xBi_(2-x)Ti_4O_11

作　　者：孟进芳[1] 邹广田[1] 崔启良[1] 赵永年[1] 

机构地区：[1]吉林大学超硬材料国家重点实验室

出　　处：《物理学报》1994年第10期1739-1744,共6页Acta Physica Sinica

摘　　要：合成了Ｌａ＿ｘＢｉ＿（２－Ｘ）Ｔｉ＿４Ｏ＿１１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。Ｌａ＿０．２Ｂｉ＿１．８·Ｔｉ＿４Ｏ＿１１的相变温度为２００℃。初步获得Ｌａ＿２Ｔｉ＿４Ｏ＿１１的结构为正交结构。Abstract The system La_XBi_(2-x)Ti_4O_11 has been synthesised,their Raman spectra and powderx ray diffraction pattern as well as the high temperature Raman spectra of La_0.2Bi_1.8Ti_4O_11 have been measured.The results show that the phase transition at x=1.2occurring in La_xBi_(2-x)Ti_4O_11 is correlated with the lowest frequency phonon modeThe Phase transition temperature of La_xBi_(2-x)Ti_4O_11 is 200℃. The structure of La_xBi_(2-x)Ti_4O_11can be considered as an orthorhombic one.

关 键 词：钛酸铋 镧 掺杂 合成 相变 

分 类 号：O792[理学—晶体学]