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Title: Niobium powder synthesized by calciothermic reduction of niobium hydroxide for use in capacitors
Authors: Baba, Masahiko
Kikuchi, Tatsuya
Suzuki, Ryosuke O.
Author's alias: 鈴木, 亮輔
Keywords: Electronic materials
Elements
Electrical properties
Crystal growth
Chemical synthesis
Issue Date: Mar-2015
Publisher: Elsevier Ltd.
Journal title: Journal of Physics and Chemistry of Solids
Volume: 78
Start page: 101
End page: 109
Abstract: Metallic niobium powder was produced for applications in electric capacitors via calciothermic reduction of niobium hydroxide in molten CaCl2. Sub-micrometer spherical metallic particles with coral-like morphologies reflected the particle size of the starting oxide powder. A fine powder was obtained from the mixtures of niobium hydroxide and CaO or Ca(OH)2, respectively. Sintered pellets of the metallic powder showed a higher capacitance (CV) than those of the simply reduced powder without pre-treatment, because the shrinkage during sintering was smaller. The CV was as large as that of commercially sintered pellets for tantalum capacitors. Therefore, this niobium powder would act as a higher-voltage capacitor by applying chemical anodic treatment at higher voltages, and lower oxygen content in the reduced power could realize a lower leak current.
Rights: © 2014 Elsevier Ltd.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/193298
DOI(Published Version): 10.1016/j.jpcs.2014.11.014
Appears in Collections:Journal Articles

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