CsH2PO4铁电材料的电热和气压效应

IF 0.9 4区物理与天体物理 Q4 PHYSICS, CONDENSED MATTER

Condensed Matter Physics Pub Date : 2023-01-04 DOI:10.5488/CMP.25.43711

A. Vdovych, R. Levitskii, I. R. Zachek

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引用次数: 0

摘要

为了研究CsH2PO4铁电晶体的热效应，采用了一种修正的赝自旋模型，该模型考虑了赝自旋相互作用参数对晶格应变的依赖性。该模型还考虑了伪自旋有效偶极矩对序参量的依赖性。在双粒子簇近似下，研究了纵向电场和静水压力对晶体摩尔熵的影响。研究了热效应和气压效应。计算出的电热温度变化约为1k;它可以在静水压力的作用下改变其符号。压热温度变化约为-0.5 K;在计算中没有考虑晶格的非调和性。

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Electrocaloric and barocaloric effects in CsH2PO4 ferroelectric

To investigate the caloric effects in the CsH2PO4 ferroelectric, a modified pseudospin model of this crystal is used, which takes into account the dependence of the parameters of interaction between pseudospins on lattice strains. The model also takes into account the dependence of the effective dipole moment of a pseudospin on the order parameter. In the two-particle cluster approximation, the influence of the longitudinal electric field and hydrostatic pressure on the molar entropy of the crystal was studied. The electrocaloric and barocaloric effects were studied. The calculated electrocaloric temperature change is about 1 K; it can change its sign under the influence of hydrostatic pressure. Barocaloric temperature change is about -0.5 K; lattice anharmonicities were not taken into account in its calculations.

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来源期刊

Condensed Matter Physics 物理-物理：凝聚态物理

CiteScore

1.10

自引率

16.70%

发文量

审稿时长

1 months

期刊介绍： Condensed Matter Physics contains original and review articles in the field of statistical mechanics and thermodynamics of equilibrium and nonequilibrium processes, relativistic mechanics of interacting particle systems.The main attention is paid to physics of solid, liquid and amorphous systems, phase equilibria and phase transitions, thermal, structural, electric, magnetic and optical properties of condensed matter. Condensed Matter Physics is published quarterly.