Investigation of Room Temperature Ferromagnetic Nanoparticles of Gd5Si4
Investigation of Room Temperature Ferromagnetic Nanoparticles of Gd5Si4
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Gd5Si4 室温铁磁纳米粒子的研究
DOI：
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发表时间：
2015
影响因子：
2.1
通讯作者：
D. Jiles
中科院分区：
文献类型：
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作者：
R. Hadimani;Shalabh Gupta;S. Harstad;V. Pecharsky;D. Jiles
当x~=0.5时，Gd5(SixGe1-x)4化合物在接近室温时发生一级相变，并伴随着性能的剧烈变化。我们报告了使用高能球磨法制造母体化合物之一 Gd5Si4 的纳米颗粒。研究了晶体结构、微观结构和磁性能。研磨时间长时颗粒会发生团聚，研磨 >20 分钟的颗粒会失去结晶度，并且不再经历接近 340 K 的磁相变，而磁相变则存在于块状材料中。研磨超过 20 分钟的样品表现出矫顽力略有增加。 275 K高温下的磁化强度随着球磨时间的增加而降低。
Gd5(SixGe1-x)4 compounds undergo first-order phase transitions close to room temperature when x ~ = 0.5, which are accompanied by extreme changes of properties. We report the fabrication of the nanoparticles of one of the parent compounds-Gd5Si4-using high-energy ball milling. Crystal structure, microstructure, and magnetic properties have been investigated. Particles agglomerate at long milling times, and the particles that are milled >20 min lose crystallinity and no longer undergo magnetic phase transition close to 340 K, which is present in a bulk material. The samples milled for >20 min exhibit a slightly increased coercivity. Magnetization at a high temperature of 275 K decreases with the increase in the milling time.