Nanostructured D022-Mn2Ga Alloys with High Magnetization and Coercivity

被引：16
作者：
El-Gendy, Ahmed A. [1 ,2 ]
Hadjipanayis, George C. [1 ]
机构：
[1] Univ Delaware, Dept Phys & Astron, Newark, DE 19711 USA
[2] Natl Inst Stand, Nanotechnol & Nanometrol Lab, Giza 12211, Egypt
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2015年 / 119卷 / 16期
关键词：
Supercritical fluids - Binary alloys - Manganese alloys - Grain size and shape - Coercive force - Gallium alloys - Permanent magnets - Effluent treatment - Magnetization;
D O I：
10.1021/jp5105449
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：
Nanostruttured Mn2Ga alloys with the majority D0(22) phase have been prepared by subjecting ball-milled powders with micron size grains to the supercritical conditions of fluids at high pressure of 850 psi and temperature of 250 degrees C. The use of supercritical fluids was found to lead to a reduction of grain size from microscale to nanoscale. The supercritically treated samples show a homogeneous microstructure with an average grain size of 35 nm. The magnetic:properties Show an enhancement of magnetization and coercivity with values M-s and H-c of 55 emu/g and 4.7 kOe, respectively. This new method of, enhancing the coercive field by a factor of more than two via the reduction Of grain size to nanoscale opens new routes for rare-earth-free permanent magnet development.
引用
收藏
页码：8898 / 8903
页数：6
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