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首页> 外文期刊>Phase Transitions >Manifestation of phase transformations in optical spectra of Na0.5Bi0.5TiO3 crystals between 25 degrees C and 350 degrees C
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Manifestation of phase transformations in optical spectra of Na0.5Bi0.5TiO3 crystals between 25 degrees C and 350 degrees C

机译:Na0.5Bi0.5TiO3晶体在25摄氏度至350摄氏度之间的光谱中表现出相变

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摘要

The pseudo dielectric function (E) = (E) + i (E) of sodium bismuth titanate Na0.5Bi0.5TiO3, has been obtained in the spectral range of electronic excitations (2-9.5 eV) by spectroscopic ellipsometry using the synchrotron radiation source BESSY II. The spectrum contains a broad absorption band at 4.2-4.5 eV. The temperature dependence in the range of 25-350 degrees C is presented by the related susceptibilities (T) and (T) at 5 eV. A clear peculiarity in the temperature behavior of (T) and (T) between 180 and 320 degrees C has been revealed and discussed. In this range an extremum-like temperature dependence of intensity of the light reflected from the sample surface, has been revealed and can be explained by the diffraction of light on the grid of the elastic domain structure of the sample.
机译:钛酸铋钠Na0.5Bi0.5TiO3的拟介电函数<ε>(E)= <ε(1)>(E)+ i <ε(2)>(E),已在电子的光谱范围内获得使用同步辐射源BESSY II通过椭圆偏振光谱法激发(2-9.5 eV)。光谱在4.2-4.5 eV处具有较宽的吸收带。在5 eV时,相关磁化率(T)和(T)表示25-350摄氏度范围内的温度依赖性。已经揭示并讨论了180至320摄氏度之间(T)和(T)的温度行为的明显特征。在该范围内,已经揭示出从样品表面反射的光的强度的极值状温度依赖性,并且可以通过光在样品的弹性域结构的栅格上的衍射来解释。

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