Frequency and Temperature Response of the Polarization of Barium Titanate
Frequency and Temperature Response of the Polarization of Barium Titanate
复制标题
钛酸钡极化的频率和温度响应
DOI：
10.1103/physrev.136.a429
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发表时间：
1964
期刊：
影响因子：
--
通讯作者：
J. Ballantyne
中科院分区：
文献类型：
--
作者：
J. Ballantyne
通过对偏振单晶的透射率和反射率的测量，测定了BaTiO_3在1-1000 cm−-1和24-200℃范围内的偏振频率和温度响应。在透射率为491 cm−-1处观察到单一吸收带，在反射率为10-80 cm-−-1处有一下降，吸收带位于175和470 cm-−-1附近。这些吸收带随温度的变化而发生分裂。反射率分析表明，单区BaTiO_3的偏振色散由12、182和491 cm−_1处的共振组成。12 cm−_1处的共振是高度衰减的，并且表现出反常的色散。12 cm−-1共振的积分强度很大，居里点以上的积分强度随温度的升高而迅速减小。其频率保持在24至200C范围内的6至22厘米−1之间。
The frequency and temperature response of the polarization of BaTi O 3 from 1 to 1000 cm− 1 and between 24 and 200 C has been determined by transmission and reflectivity measurements on polarized single crystals. A single absorption band located at 491 cm− 1 was observed in transmission, while in reflectivity a drop occurs from 10 to 80 cm− 1 and absorption bands are located near 175 and 470 cm− 1. These bands show temperature-dependent splittings caused by changes in crystal symmetry. Reflectivity analysis indicates that the dispersion of the polarization in single-domain BaTi O 3 consists of resonances at 12, 182, and 491 cm− 1. The 12-cm− 1 resonance is highly damped and exhibits an unusual dispersion. The integrated intensity of the 12-cm− 1 resonance is very large, and above the Curie point decreases rapidly with increasing temperature. Its frequency remains between 6 and 22 cm− 1 in the 24 to 200 C range.