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

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Fang, Dao-lai and Wang, Zhong-bing and Yang, Ping-Hua and Liu, Wei and Chen, Chu-Sheng and Winnubst, A.J.A. (2006) Preparation of Ultra-Fine Nickel Manganite Powders and Ceramics by a Solid-State Coordination Reaction. Journal of the American Ceramic Society, 89 (1). pp. 230-235. ISSN 0002-7820

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Abstract: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%.
Item Type:Article
Copyright:American Ceramic Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/71888
Official URL:http://dx.doi.org/10.1111/j.1551-2916.2005.00666.x
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Metis ID: 235231