（1CNMC Ningxia Orient Group Co., Ltd., Shizuishan 753000, China） （2National Engineering Research Center of Tantalum and Niobium Special Metal Materials, Shizuishan 753000, China）
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DOI:
10.7502/j.issn.1674-3962.2016.10.05
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Abstract:
Ultrafine spherical nickel powders used for multilayer ceramic capacitor (MLCC) inner electrodes were prepared by coating and thermal decomposition with the nickel oxalate as precursor, zinc oxalate as coating agent, and in the high temperature calcinations. The influence of sintering temperature on crystalline properties of nickel powders was mainly studied. The obtained powder samples were characterized by means of Xray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), laser particle size distribution instrument, thermogravimetric(TG), and Xray photoelectron spectroscopy(XPS). The results indicated that the initial crystalline grain size of nickel powder increased with the rising of sintering temperature. The high purity spherical nickel particles had the facecentered cubic(fcc) crystal structure, excellent crystallinity，high oxidation temperature and their final diameters were between 200 and 500 nm with narrow size distribution.