On entropy determination from magnetic and calorimetric experiments in conventional giant magnetocaloric materials

被引：23

作者：

Chen, Jing-Han ^{[1
]}

Saleheen, Ahmad Us ^{[1
]}

Adams, Philip W. ^{[1
]}

Young, David P. ^{[1
]}

Ali, Naushad ^{[2
]}

Stadler, Shane ^{[1
]}

机构：

[1] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[2] Southern Illinois Univ, Dept Phys, Carbondale, IL 62901 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2018年 / 123卷 / 14期

基金：

美国国家科学基金会;

关键词：

SHAPE-MEMORY ALLOYS; HEAT-CAPACITY; TRANSITION; MNAS1-XSBX; VICINITY; RIBBONS; PHASE; CU;

D O I：

10.1063/1.5016858

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this work, we discuss measurement protocols for the determination of the magnetic entropy change associated with first-order magneto-structural transitions from both magnetization and calorimetric experiments. The Cu-doped Ni2MnGa Heusler alloy with a first-order magneto-structural phase transition is used as a case study to illustrate how commonly-used magnetization measurement protocols result in spurious entropy evaluations. Two magnetization measurement protocols which allow for the accurate assessment of the magnetic entropy change across first-order magneto-structural transitions are presented. In addition, calorimetric measurements were performed to validate the results from the magnetization measurements. Self-consistent results between the magnetization and calorimetric measurements were obtained when the non-equilibrium thermodynamic state was carefully handled. Such methods could be applicable to other systems displaying giant magnetocaloric effects caused by first-order phase transitions with magnetic and thermal hysteresis. Published by AIP Publishing.

引用

页数：7

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