Sr_(1-x)La_xTiO_3的高温高压合成及XPS研究

THE SYNTHESIS OF Sr 1- x La x TiO 3 UNDER HIGH TEMPERATURE AND HIGH PRESSURE AND ITS XPS STUDY

利用高温高压方法合成了有稀土元素Ｌａ掺杂的钙钛矿氧化物Ｓｒ１－ｘＬａｘＴｉＯ３。ＸＲＤ测试表明，在ｘ≤０．５时，样品基本为单相，呈立方相；晶胞体积随ｘ的增加而增加，在ｘ＝０．４时开始减小。ＸＰＳ测量发现，样品中存在Ｔｉ离子的变价。讨论了Ｔｉ离子价态的变化对晶格参数的影响。

The perovskite oxides,Sr 1- x La x TiO 3,were synthesized at high temperature and high pressure.XRD measurement shows that the samples with x ≤0.5 are in single phase and belong to cubic phase structure.Cell volume increase at beginning of x ,then decrease at x =0.4.XPS analysis indicates that Ti ions are in mixed valence.The influence of valence state of Ti ions on the lattice parameters is discussed.