Origin and tuning of the magnetocaloric effect in the magnetic refrigerant Mn1.1Fe0.9(P0.8Ge0.2)

被引：64

作者：

Liu, Danmin ^{[1
,2
]}

Yue, Ming ^{[1
]}

Zhang, Jiuxing ^{[1
]}

McQueen, T. M. ^{[3
]}

Lynn, Jeffrey W. ^{[2
]}

Wang, Xiaolu ^{[1
]}

Chen, Ying ^{[2
,4
]}

Li, Jiying ^{[2
,4
]}

Cava, R. J. ^{[3
]}

Liu, Xubo ^{[5
,6
]}

Altounian, Zaven ^{[5
,6
]}

Huang, Q. ^{[2
]}

机构：

[1] Beijing Univ Technol, Minist Educ, Key Lab Adv Funct Mat, Beijing 100022, Peoples R China

[2] Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA

[3] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[4] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[5] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[6] McGill Univ, Ctr Phys Mat, Montreal, PQ H3A 2T8, Canada

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 01期

基金：

国家高技术研究发展计划(863计划); 美国国家科学基金会;

关键词：

crystal structure; entropy; ferromagnetic materials; germanium alloys; iron alloys; magnetisation; magnetocaloric effects; manganese alloys; neutron diffraction; paramagnetic materials; phosphorus alloys; refrigerants; solid-state phase transformations; ENTROPY CHANGE; ROOM-TEMPERATURE; TRANSITION; COMPOUND;

D O I：

10.1103/PhysRevB.79.014435

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Neutron-diffraction and magnetization measurements have been carried out on a series of samples of the magnetorefrigerant Mn1+yFe1-yP1-xGex. The data reveal that the ferromagnetic and paramagnetic phases correspond to two very distinct crystal structures, with the magnetic-entropy change as a function of magnetic field or temperature being directly controlled by the phase fraction of this first-order transition. By tuning the physical properties of this system we have achieved a magnetic-entropy change [magnetocaloric effect (MCE)] for the composition Mn1.1Fe0.9P0.80Ge0.20 that has a similar shape for both increasing and decreasing field, with the maximum MCE exceeding 74 J/kg K-substantially higher than the previous record. The diffraction results also reveal that there is a substantial variation in the Ge content in the samples which causes a distribution of transition temperatures that reduces the MCE. It therefore should be possible to improve the MCE to exceed 100 J/kg K under optimal conditions.

引用

页数：7

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