On entropy change measurements around first order phase transitions in caloric materials

被引：40

作者：

Caron, Luana ^{[1
]}

Nguyen Ba Doan ^{[2
,3
]}

Ranno, Laurent ^{[2
,3
]}

机构：

[1] Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany

[2] Univ Grenoble Alpes, Inst NEEL, F-38000 Grenoble, France

[3] CNRS, Inst NEEL, F-38000 Grenoble, France

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2017年 / 29卷 / 07期

关键词：

magnetocaloric effect; entropy change; Maxwell relations; ADIABATIC TEMPERATURE-CHANGE; MAGNETIZATION;

D O I：

10.1088/1361-648X/aa50d1

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In this work we discuss the measurement protocols for indirect determination of the isothermal entropy change associated with first order phase transitions in caloric materials. The magnetostructural phase transitions giving rise to giant magnetocaloric effects in Cu-doped MnAs and FeRh are used as case studies to exemplify how badly designed protocols may affect isothermal measurements and lead to incorrect entropy change estimations. Isothermal measurement protocols which allow correct assessment of the entropy change around first order phase transitions in both direct and inverse cases are presented.

引用

页数：7

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