Preparation of Ultra-Fine Nickel Manganite Powders and Ceramics by a Solid-State Coordination Reaction

Dao-lai Fang, Zhongbing Wang, Zhichun Wang, Pinghua Yang, W. Liu, Wei Liu, Aloysius J.A. Winnubst, Chusheng Chen

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A solid-state coordination reaction was adopted to prepare negative temperature coefficient ceramics. A mixed oxalate NiMn2(C2O4)3·6H2O, a coordination compound, was synthesized by milling a mixture of nickel acetate, manganese acetate, and oxalic acid for 5 h at room temperature. An ultrafine NiMn2O4 powder was obtained by calcining the mixed oxalate in air at 850°C for 2 h. Ceramics with a relative density of more than 97% were achieved by sintering powder compacts at a temperature as low as 1050°C for 5 h. The specific electrical resistivity ρ25°C and the thermal constant B25°/85°C were 2174 Ω·cm and 3884 K, respectively. The drift of the resistivity after aging at 150°C for 1000 h was 3.0%.
Original languageUndefined
Pages (from-to)230-235
JournalJournal of the American Ceramic Society
Issue number1
Publication statusPublished - 2006


  • IR-71888
  • METIS-235231

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