摘要
测量并研究了不同温度(室温—1573K)范围内KTN晶体的拉曼光谱及其熔体的高温拉曼光谱,分析了KTN晶体结构随温度变化的规律及其熔体的结构特征.随着温度的升高,KTN晶体的拉曼光谱谱峰都不同程度地向低波数方向移动,同时存在不同程度的展宽,并伴随强度的减弱.观察并解释了温度353K附近KTN晶体样品的四方—立方转相现象.研究了KTN晶体拉曼光谱中538cm-1,585cm-1,835cm-1和877cm-1谱峰及其熔体高温拉曼光谱中868cm-1谱峰的出现、消失、峰强变化等特殊现象.在KTN高温熔体中,[Ta/NbO6]八面体结构基团消失,而大量的Ta/NbO双键以[Ta/NbO3]-结构基团的形式存在,即熔体中存在的是[Ta/NbO3]-生长基元.
The high temperature Raman spectra of KTN crystal and melt were studied.The structures of KTN crystal and melt were analyzed.The rule of structure change of KTN crystal with increasing temperature was analyzed.The results show that the peaks of spectra move to the lower wavelength and broaden by different degrees.The intensities of spectra peaks decrease,too.Raman peaks at 538,585,835,868 and 875cm -1 were analyzed in detail.Phase transition from tetragonal to cubic was observed and explained.In high temperalure KTN melt,the [Ta/NbO_6] octahedron entities disappeared.Meanwhile,there were many Ta/Nb O double bonds in the [Ta/NbO_3]- entities.It showed that there were [Ta/NbO3]- growth unities in KTN melts.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2009年第1期570-574,共5页
Acta Physica Sinica
基金
国家自然科学基金(批准号:50472104)资助的课题~~
关键词
高温拉曼光谱
熔体
KTN晶体
high temperature Raman spectra,melt,KTN crystal
