Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 19    No. 2    April 2009

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Preparation of fine nickel powders via reduction of nickel hydrazine complex precursors
HUANG Guo-yong(黄国勇)1, XU Sheng-ming(徐盛明)1, XU Gang(徐 刚)1,
LI Lin-yan(李林艳)1,ZHANG Li-feng(张立峰)2

1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
2. Department of Materials Science and Engineering, Missouri University of Science and Technology,
223 McNutt Hall, Rolla, MO 65409, USA

Abstract: Fine nickel(Ni) powders with controllable particle sizes were synthesized via the reduction of nickel hydrazine complex precursors of pure [Ni(N2H4)2]Cl2 and a mixture of [Ni(N2H4)2]Cl2 and [Ni(N2H4)3]Cl2 in aqueous solution. The mechanism of the formation of metallic Ni powders experiences the reduction of nickel hydroxide by hydrazine released from the ligand exchange reaction between nickel hydrazine complex and NaOH. In comparison with the method of preparing Ni powders from nickel salts, the method of making Ni powders via the reduction of nickel hydrazine complex precursors shows the advantages of using half dosage of hydrazine for complete reduction of nickel ions in solution, and the obtained Ni particles show less agglomeration and better dispersibility. Moreover, the average particle size of nickel powders can be controlled from 180 to 260 nm by adjusting the reaction molar ratio and concentration.

 

Key words: multilayer ceramic capacitors; chemical reduction; nickel hydrazine complex; nickel powders; precursor

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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