摘要
使用4∶1的甲醇-乙醇混合液作传压介质，利用金刚石对顶砧装置（DAC），研究了层状铁电体Sr2Bi4Ti5O18的在位高压拉曼光谱和压致结构相变（0～27GPa）。发现在8．31GPa，Sr2Bi4Ti5O18经历了一次结构相交。在23．13GPa以上，Sr2Bi4Ti5O18似乎出现了压致非晶相交的先兆。并使用内模方法对Sr2Bi4Ti5O18的内模进行了指认。
The in situ high pressure Raman spectra and the pressure-induced structure phase transitions of layered ferroelectrics Sr2Bi4Ti5O18 have been studied in the range of 0-27GPa with diamond anvil cell (DAC), using methanol-ethanol (4:1) mixture as transmission medium. We assigned the internal modes of Sr2Bi4Ti5O18 according to internal mode approach. It is found Sr2Bi4Ti5O18 experienced a structure phase transition at 8. 31GPa. Over 23. 13GPa, Sr2Bi4Ti5O18 displayed a clear indication of amorphous phase transition.
出处
《高压物理学报》
CAS
CSCD
北大核心
1998年第3期233-235,共3页
Chinese Journal of High Pressure Physics
关键词
层状
铁电体
高压
DAC
压致结构相变
layered ferroelectrics, Sr_2Bi_4Ti_5O_(18), high pressure, DAC.
