氟铍酸铵相位调制介质介电常数的温度特性
Temperature dependence of dielectric permittivity in incommensurately modulated phase of ammonium fluoroberyllate
摘要：
研究了铁电氟铍酸铵（AFB）晶体在其相变点附近沿极轴方向的介电常数随温度的变化关系。将实验数据与文献中的Curie-Weiss（CW）定律、广义Curie-Weiss（GCW）定律、Levanyuk和Sannikov（LS）模型以及Prelovšek、Levstik和Filipi（PLF）模型的预言进行了比较。结果表明，LS模型比CW、GWC和PLF模型更好地描述了AFB晶体介电常数的温度行为。阐明了造成这种情况的主要物理原因。
英文摘要：
We study the temperature dependence of dielectric permittivity along the polar axis for ferroelectric ammonium fluoroberyllate (AFB) crystal in the vicinity of its phase transition points. The experimental data within incommensurately modulated phase of AFB is compared with the predictions of phenomenological models known from the literature: the Curie-Weiss (CW) law, the generalized Curie-Weiss (GCW) law, and the models by Levanyuk and Sannikov (LS) and by Prelovšek, Levstik and Filipič (PLF) suggested for improper ferroelectrics. It is shown that the LS approach describes the temperature behavior of the dielectric permittivity for the AFB crystal better than the CW, GWC and PLF models. The main physical reasons of this situation are elucidated.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
