Niobium powder synthesized by calciothermic reduction of niobium hydroxide for use in capacitors

• Baba, Masahiko

• Kikuchi, Tatsuya

• Suzuki, Ryosuke O.

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.

Journal

• Journal of Physics and Chemistry of Solids

  Journal of Physics and Chemistry of Solids 78 101-109, 2015-03

  Elsevier Ltd.

Keywords

• Electronic materials
• Elements
• Electrical properties
• Crystal growth
• Chemical synthesis

Details

• CRID: 1050282810779188352
• NII Article ID: 120005530841
• NII Book ID: AA00704949
• ISSN: 00223697
• DOI: 10.1016/j.jpcs.2014.11.014
• HANDLE: 2433/193298
• HANDLE: 2115/57791
• Web Site: https://api.elsevier.com/content/article/PII:S002236971400287X?httpAccept=text/xml
• Web Site: https://api.elsevier.com/content/article/PII:S002236971400287X?httpAccept=text/plain
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN