混合甜菜碱磷酸盐-甜菜碱亚磷酸盐、CuInP_2(S_xSe_{1-x})_6晶体及PMN-PSN-PZN陶瓷的宽带介电谱研究
Broadband Dielectric Spectroscopy of Mixed Betaine Phosphate Betaine Phosphite, CuInP_2(S_xSe_{1-x})_6 crystals and PMN-PSN-PZN Ceramics
AI总结：
本研究通过宽带介电谱系统研究了混合甜菜碱磷酸盐-亚磷酸盐晶体、CuInP2(SxSe1-x)6晶体及PMN-PSN-PZN弛豫铁电体的相变动力学、弛豫时间分布与极性纳米区域形成机制。
摘要：
第一章综述了关于晶体无序系统的当前观点，并以允许最直接解释的结果为例进行说明。专门考虑旨在针对宽带介电谱结果。文中对弛豫时间分布的几种预定义形式及其物理意义提出了一些批评性意见。第二章致力于宽带介电谱的实验和理论方法，作者应用这些方法亲自收集了原始数据。第三章包含混合氢键甜菜碱亚磷酸盐-甜菜碱磷酸盐相变动力学的研究结果。此处给出了所研究晶体的弛豫时间分布、双阱势参数和局域极化分布。第四章介绍了混合CuInP2(SxSe1-x)6晶体的介电谱结果，并讨论了这些晶体的相图。第五章包含PMN-PSN-PZN弛豫铁电体在极宽频率范围内的介电谱。在伯恩斯温度（700-800 K）以下极性纳米区域的形成表现为太赫兹范围内介电弛豫的出现以及红外光谱中极性模式的分裂。使用Tichonov正则化方法根据弛豫时间分布分析介电谱。在室温附近，分布分裂为两个分量，并讨论了这两个分量的起源。在红外光谱中观察到有趣的声子异常。
英文摘要：
TIn the first chapter, the current ideas about crystalline disordered system are surveyed and exemplified by the results allowing for the most straightforward interpretation. Exclusive consideration is intended for broadband dielectric spectroscopy results. Several critical remarks are presented about various predefined forms of the distribution of relaxation times and it physical meaning. The second chapter is devoted to the experimental and theoretical methods of the broadband dielectric spectroscopy, which have been applied by the author to collect the original data personally. The third chapter contains results of investigations of the mixed hydrogen-bond betaine phosphite betaine phosphate phase transitions dynamics. Here distribution of the relaxation times, double well potential parameters, local polarization distributions of the investigated crystals are presented. In the fourth chapter the dielectric spectroscopy results of mixed CuInP2(SxSe1-x)6 crystals are presented, phase diagram of these crystals is discussed. The fifth chapter contains the dielectric spectra of PMN-PSN-PZN relaxor ferroelectrics in a very wide frequency range. Formation of the polar nanoregions below the Burns temperature (700-800 K) is manifested by the appearance of the dielectric relaxation in the THz range and by splitting of polar modes in the infrared spectra. Dielectric spectra are analyzed in terms of distribution of relaxation times using the Tichonov regularization method. The distributions splits in two components near room temperature and the origin of both components are discussed. In the infrared spectra interesting phonon anomalies are observed.
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