Asymmetric first-order transition and interlocked particle state in magnetocaloric La(Fe,Si)13

被引：58

作者：

Waske, Anja ^{[1
]}

Giebeler, Lars ^{[1
]}

Weise, Bruno ^{[1
,2
]}

Funk, Alexander ^{[1
,2
]}

Hinterstein, Manuel ^{[2
,3
]}

Herklotz, Markus ^{[1
]}

Skokov, Konstantin ^{[4
]}

Faehler, Sebastian ^{[1
]}

Gutfleisch, Oliver ^{[4
]}

Eckert, Juergen ^{[1
,2
]}

机构：

[1] IFW Dresden, PO 270116, D-01171 Dresden, Germany

[2] Tech Univ Dresden, Inst Mat Sci, D-01069 Dresden, Germany

[3] Deutsch Elektronen Synchrotron DESY, D-22607 Hamburg, Germany

[4] Tech Univ Darmstadt, D-64287 Darmstadt, Germany

来源：

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS | 2015年 / 9卷 / 02期

关键词：

magnetic refrigeration; magnetocaloric materials; phase transitions; La(Fe; Si)(13); X-ray diffraction; FIELD;

D O I：

10.1002/pssr.201409484

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In-situ synchrotron XRD measurements of the magnetocaloric material LaFe11.8Si1.2 are used to understand virgin effects and asymmetry of the underlying first order magnetovolume transition. A remarkable change of the transition kinetics occurs after the first cycle, which we attribute to the formation of cracks originating from the volume change. Tomographic imaging revealed that the bulk material disintegrates via an interlocked state where fragments are loosely connected. Though cracks have opened between the fragments, the transition is sharp, which we attribute to magnetostatic interactions. In the cycled sample we find a strong asymmetry between the transition interval upon heating and cooling, which we explain by isostatic pressure acting on parts of the sample during the cooling transition. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：136 / 140

页数：5

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