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《China Powder Science and Technology》 2006-04
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Preparation and Microwave Properties of Co Ultrafine Powder by Electroless Plating

ZHANG Hai-jun WU Xiang-wei JIA Quan-li JIA Xiao-lin (Institute of High Temperature Ceramics,Zhengzhou University,Zhengzhou 450052,China)  
Metallic Co ultrafine powders were prepared by electroless plating method using CoSO_4·7H_2O,NaH_2PO_2·H_2O,etc as starting mate- rials,the experimental conditions were as follows, [Co~2+]=0.30 mol/L. [Co~2+]:[NaH_2PO_2 H_2O]=1:8(mol ratio),pH=9.8,T=90℃,[Co~2+]:[Na_3Cit] =2:1 (mol ratio),DBS 0.5% (mass fraction).X-ray diffractometry and scanning electron microscopy were used to obtain detailed information on the crystallography of the ultrafine cobalt powders.The complex dielec- tric constant and complex permeability dispersion were investigated us- ing network analyzer in 8.2~12.4 GHz by the waveguide method.It indi- cated that the average particles size of the ultrafine cobalt powders was about 0.5~1.0μm,its crystals were observed to be square and global in morphology.The dielectric loss of Co ultrafine powders showed a small value about zero in all measuring frequencies,which magnetic loss was about 1.3.
【Fund】: 河南省杰出青年科学基金,编号:0512002400。
【CateGory Index】: TB34
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