论文标题
静静力压力和纵向电场对Quasione-维CSH $ _2 $ po $ _4 $ po $ _4 $ po $ _4 $ po $ _4 $的相变和热力学特征的影响
Effect of hydrostatic pressure and longitudinal electric field on phase transitions and thermodynamic characteristics of quasione-dimensional CsH$_2$PO$_4$ ferroelectric
论文作者
论文摘要
我们为Quasione维CSH $ _2 $ PO $ _4 $带有氢键的Ferroelectric提出了一个两种公共的质子订购模型，该模型具有氢键，该模型在晶格菌株$ u_1 $，$ u_2 $，$ u_2 $，$ u_3 $和$ u_5 $贡献Proton Proton subsedysty的能源的贡献上。该模型还考虑了伪替辛对顺序参数的有效偶极矩的依赖性，这使一个人能够同意降压和铁电阶段中有效的偶极矩。在此模型中，在短距离相互作用和远程相互作用的平均场近似中，在两粒子簇近似中，在静水压力和纵向电场的作用下，研究了自发极化，纵向介电介电常数和摩尔热容量的行为。解释了高压下的相位转变为抗抗逆抗虫相。研究了电场存在下的降压型 - 弗洛电相变的涂抹特征以及抑制抗抗逆火相的特征。
We propose a two-sublattice proton ordering model for the quasione-dimensional CsH$_2$PO$_4$ ferroelectric with hydrogen bonds, which takes into account linear on lattice strains $u_1$, $u_2$, $u_3$ and $u_5$ contribution to the energy of proton subsystem. The model also takes into account the dependence of effective dipole moments of pseudospins on the order parameters, which enables one to agree the effective dipole moments in paraelectric and ferroelectric phases. Within this model in two-particle cluster approximation on short-range interactions and in the mean field approximation on long-range interactions, there is investigated the behaviour of spontaneous polarization, longitudinal dielectric permittivity and molar heat capacity under the action of hydrostatic pressure and longitudinal electric field. The phase transition into antiferroelectric phase under high pressures is explained. The character of smearing of the paraelectric-ferroelectric phase transition as well as suppression of the antiferroelectric phase at the presence of electric field is studied.
