Soft-Mode Study in Li-Doped KTaO3
Soft-Mode Study in Li-Doped KTaO3
复制标题
掺锂 KTaO3 的软模研究
DOI：
10.1080/00150190490453676
复制
发表时间：
2004
期刊：
影响因子：
0.8
通讯作者：
S. Kapphan
中科院分区：
文献类型：
--
作者：
V. Železný;A. Pashkin;J. Petzelt;M. Savinov;V. Trepakov;S. Kapphan
首次研究了锂掺杂 KTaO3 的红外和太赫兹光谱，并与低频介电测量进行了比较。软模式的频率随着冷却而降低，并遵循先前超拉曼测量发现的趋势。在锂掺杂晶体中，模式软化不那么明显，因此，模式对静态介电常数的贡献较低。除此之外，在介电谱 (102–109 Hz) 中观察到典型的弛豫行为。在 10 cm−1 以下观察到反射率和介电损耗的上升，这表明存在中心峰。
The infrared and terahertz spectra of lithium doped KTaO3 have been studied for the first time and compared with low-frequency dielectric measurements. The frequency of the soft mode decreases on cooling and follows the tendency found by previous hyper-Raman measurements. In Li-doped crystals the mode softening is not so pronounced and therefore, the mode contribution to static dielectric constant is lower. In addition to that a typical relaxor behavior is observed in dielectric spectroscopy (102–109 Hz). The rise of the reflectivity and dielectric loss is observed below 10 cm−1, which indicates presence of a central peak.