期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 419, 期 -, 页码 125-130出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2016.06.033
关键词
Nano-particulate invar alloys; XRD; SEM; VSM; Electrical conductivity
Fe-Ni-Cu invar alloys of various compositions (Fe65Ni35-xCux, x=0, 0.2, 0.6, 1, 1.4 and 1.8) were synthesized via chemical reduction route. These alloys were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometry (VSM) techniques. The XRD analysis revealed the formation of face centered cubic (fcc) structure. The lattice parameter and the crystallite size of the investigated alloys were calculated and the line broadening indicated the nano crystallites size of alloy powder. The particle size was estimated from SEM and it decreases by the incorporation of Cu and found to be in the range of 24-40 nm. The addition of Cu in these alloys appreciably enhances the saturation magnetization and it increases from 99 to 123 emu/g. Electrical conductivity has been improved with Cu addition. The thermal conductivity was calculated using the Wiedemann-Franz law. (C) 2016 Elsevier B.V. All rights reserved.
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