Mixed Magnetism for Refrigeration and Energy Conversion

被引：253

作者：

Dung, Nguyen H. ^{[1
]}

Ou, Zhi Qiang ^{[1
]}

Caron, Luana ^{[1
]}

Zhang, Lian ^{[1
]}

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

de Wijs, Gilles A. ^{[2
]}

de Groot, Rob A. ^{[2
]}

Buschow, K. H. Jurgen ^{[1
]}

Bruck, Ekkes ^{[1
]}

机构：

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

[2] Radboud Univ Nijmegen, Fac Sci, NL-6525 AJ Nijmegen, Netherlands

来源：

ADVANCED ENERGY MATERIALS | 2011年 / 1卷 / 06期

关键词：

TEMPERATURE; TRANSITION; SYSTEM;

D O I：

10.1002/aenm.201100252

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The efficient coupling between lattice degrees of freedom and spin degrees of freedom in magnetic materials can be used for refrigeration and energy conversion. This coupling is enhanced in materials exhibiting the giant magnetocaloric effect. First principle electronic structure calculations on hexagonal MnFe(P, Si) reveal a new form of magnetism: the coexistence of strong and weak magnetism in alternate atomic layers. The weak magnetism of Fe layers (disappearance of local magnetic moments at the Curie temperature) is responsible for a strong coupling with the crystal lattice while the strong magnetism in adjacent Mn-layers ensures Curie temperatures high enough to enable operation at and above room temperature. Varying the composition on these magnetic sublattices gives a handle to tune the working temperature and to achieve a strong reduction of the undesired thermal hysteresis. In this way we design novel materials based on abundantly available elements with properties matched to the requirements of an efficient refrigeration or energy-conversion cycle.

引用

页码：1215 / 1219

页数：5

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