欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
采用提拉发生长了Ca0.4Ba0.6Nb2O6晶体,利用偏振拉曼光谱研究了Ca0.4Ba0.6Nb2O6晶体在低温25～260 K范围内的结构稳定性。实验发现,随温度降低,NbO6六面体的内振动（ν5）模的非对称性增加,由Gauss＋Lor Amp拟合得出的相对低频（ν5）模波数和相对高频（ν5）模峰宽在70～100 K时发生突变,表明该晶体在此温度范围内可能存在相变。同时分别讨论了在x（zz）x和x（zy）x不同偏振配置下,外振动模的相对强度比随温度的变化趋势,同样发现其在该温度范围内发生明显异常。最后简单讨论了布居因子对拉曼散射强度和实验结果的影响。
英文摘要：
The Ca0.4Ba0.6Nb2O6 crystal was grown by Czochralski method.The stability of crystal structure of Ca0.4Ba0.6Nb2O6 at low temperature 25-260 K was investigated by polarized Raman spectrum.The results indicated that as the temperature decreasing,the internal ν5 mode of NbO6 increases more unsymmetric,and the wavenumbers of lower-ν5 mode and the width of higher-ν5 mode obtained from Gauss＋Lor Amp fitting show obvious variation at 70-100 K,which indicates the possibility of a structure transformation.Meanwhile,the temperature dependence of ratios of external modes under x（zz）x and x（zy）x polarizations was discussed,which also show abnornality at this temperature range.At last,the effect of population factor on Raman intensity and the experiment result was simply discussed.
同期刊论文项目
同项目期刊论文
期刊信息
位置：