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首页> 外文期刊>Crystallography reports >Investigation into the structure of ceramic Li _x Na _(1-x) Ta_(0.1)Nb_(0.9)O_3 solid solutions by X-ray analysis and Raman spectroscopy
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Investigation into the structure of ceramic Li _x Na _(1-x) Ta_(0.1)Nb_(0.9)O_3 solid solutions by X-ray analysis and Raman spectroscopy

机译：X射线分析和拉曼光谱研究陶瓷Li _x Na _（1-x）Ta_（0.1）Nb_（0.9）O_3固溶体的结构

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摘要

The structure of ceramic solid solutions Li _x Na_(1 - x) Ta_(0.1)Nb_(0.9)O_3 has been investigated by full-profile X-ray diffraction analysis and Raman spectroscopy. It is shown that their structure for all x values is similar to the NaNbO_3 structure. The structure of NaTa_(0.1)Nb_(0.9)O_3 solid solutions (x = 0) is characterized by the sp. gr. Pbcm, and the structure of Li _x Na_(1 - x) Ta_(0.1)Nb_(0.9)O_3 solid solutions with x = 0.05, 0.1, and 0.16 is characterized by the sp. gr. P2_1 ma. The unit-cell parameters decrease with an increase in x. At x = 0, doubled values of the parameter c and, correspondingly, the unit-cell volume are observed in the antiferroelectric phase. This fact is confirmed by the form of the vibrational spectrum in the region of stretching modes of oxygen atoms along the polar axis.
机译：通过全轮廓X射线衍射分析和拉曼光谱研究了陶瓷固溶体Li _x Na_（1-x）Ta_（0.1）Nb_（0.9）O_3的结构。结果表明，它们对于所有x值的结构都类似于NaNbO_3结构。 NaTa_（0.1）Nb_（0.9）O_3固溶体（x = 0）的结构由sp表征。 gr。 Pbcm和Li _x Na_（1-x）Ta_（0.1）Nb_（0.9）O_3固溶体的结构分别为sp = 0.05、0.1和0.16。 gr。 P2_1 ma。单位参数随着x的增加而减小。在x = 0时，在反铁电相中观察到参数c的两倍值以及相应的单位晶胞体积。这个事实由沿极轴的氧原子的拉伸模式区域中的振动光谱的形式证实。

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