摘要
利用高压高温合成方法合成了具有混合价态的钙钛矿氧化物La1-xNaxTiO3 。XRD测量表明 ,样品为畸变的立方钙钛矿结构 ,晶胞体积随x的增加而减小。XPS和EPR表明 ,x =0 3,0 4样品中的Ti离子为 +3、+4混合价 ,并且存在A位离子空位。IR测量表明 ,Ti-O键伸缩振动频率随x增加而增加。高压高温可以改变Ti离子的价态。
Perovskite oxides of La 1- x Na x TiO 3 with mixed valence were synthesized under high pressure and high temperature.XRD measurement shows that the samples belong to distorted cubic perovskite structure.Volumes of samples decrease as x increases.XPS and EPR measurements indicate that Ti ions are mixed valence of +3 and +4 and vacancy of A site ions exists.The valence state of Ti ions can be altered by high pressure and high temperature.IR measurement indicates that the frequency for vibration of Ti-O bond increases as x increase [WT5HZ]
出处
《高压物理学报》
CAS
CSCD
北大核心
2000年第2期105-110,共6页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金资助项目!(1980 4 0 0 5)
关键词
高压高温合成
稀土化合物
钙钛矿氧化物
谱学
high pressure and high temperature synthesis
XPS
EPR
IR
mixed valence
