First-order magnetostructural transformation in Fe doped Mn-Co-Ge alloys

被引：31

作者：

Wang, Zilong ^{[1
]}

Nie, Zhihua ^{[1
]}

Zeng, Junxi ^{[1
]}

Su, Ru ^{[1
]}

Zhang, Yuepeng ^{[2
]}

Brown, Dennis E. ^{[3
]}

Ren, Yang ^{[4
]}

Wang, Yandong ^{[1
]}

机构：

[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China

[2] Argonne Natl Lab, Div Energy Syst, Argonne, IL 60439 USA

[3] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA

[4] Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2013年 / 577卷

基金：

中国国家自然科学基金;

关键词：

Mn-Co-Ge alloys; First-order magnetostructural transformation; Magnetocaloric effect; X-ray diffraction; MAGNETIC ENTROPY CHANGE; PHASE-TRANSITION; NIMNGA; REFRIGERANTS; MEMORY;

D O I：

10.1016/j.jallcom.2013.05.205

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：

Substitution of Fe for Mn atoms in Mn-Co-Ge alloys was employed for tailoring concurrent structural and magnetic phase transitions. First-order magnetostructural transition from paramagnetic hexagonal Ni2In-type parent phase to ferromagnetic orthorhombic TiNiSi-type martensite was achieved. A giant magnetocaloric effect of Delta S-m = -9.74J kg(-1) K-1 was obtained under magnetic field change of 5 T in the vicinity of phase transition temperature. This result indicates that Fe doped Mn-Co-Ge alloys are ideal candidates for magnetic refrigeration applications. Furthermore, the magnetic field-induced martensitic transformation, associated with a large lattice strain of similar to 12%, was directly evidenced by in situ synchrotron high-energy X-ray diffraction. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：486 / 490

页数：5

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