On the determination of the magnetic entropy change in materials with first-order transitions

被引：478

作者：

Caron, L. ^{[1
,2
]}

Ou, Z. Q. ^{[1
,3
]}

Nguyen, T. T. ^{[1
]}

Thanh, D. T. Cam ^{[1
]}

Tegus, O. ^{[1
,3
]}

Bruck, E. ^{[1
]}

机构：

[1] Delft Univ Technol, Fac Sci Appl, NL-2629 JB Delft, Netherlands

[2] Univ Estadual Campinas, UNICAMP, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil

[3] Inner Mongolia Normal Univ, Key Lab Phys & Chem Funct Mat, Hohhot 010022, Peoples R China

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2009年 / 321卷 / 21期

基金：

巴西圣保罗研究基金会; 中国国家自然科学基金;

关键词：

Magnetization process; Magnetic entropy; First-order transition; Magnetic refrigeration; ADIABATIC TEMPERATURE-CHANGE;

D O I：

10.1016/j.jmmm.2009.06.086

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An accurate method to determine the magnetic entropy change in materials with hysteretic first-order transitions is presented, which is needed to estimate their potential for applications. We have investigated the effect of the maximal entropy change derived from magnetization measurements performed in different measurement processes. The results show that the isothermal entropy change can be derived from the Maxwell relations even for samples with large thermal hysteresis. In the temperature region with hysteresis, over estimating the entropy change can be avoided by measuring the isothermal magnetization of the sample after it is cooled from the paramagnetic state to the measurement temperature. In this way the so-called peak effect is not observed as shown here for a few compounds. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：3559 / 3566

页数：8

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