A Method for the Preparation of Potassium Hexafluorovanadate(III) and Its Polymorphic Transitions

• K\={o}ichir\={o} K\={o}yama

  Department of Materials Science, Himeji Institute of Technology

• Yasuhiko Hashimoto

  Department of Materials Science, Himeji Institute of Technology

抄録

In order to determine the best conditions for the preparation of potassium hexafluorovanadate(III), the reaction of V2O3 with KHF2 was studied by means of thermogravimetric analysis, differential thermal analysis and X-ray diffraction analysis. The reaction begins at about 225 °C and terminates at about 300 °C and the decomposition of excess KHF2 terminates at from 300 to 450 °C, depending on the amount of the mixture of V2O3 and KHF2. Potassium hexanuorovanadate(III) is stable in air up to about 300 °C and is oxidized at temperatures higher than 300 °C. Potassium hexanuorovanadate(III) has four polymorphic forms, and the transition points are 158, 200, and 218 °C. The transition from δ to γ or from γ to β on cooling is hindered by adding a small amount of sodium ion.

収録刊行物

• Bulletin of the Chemical Society of Japan

  Bulletin of the Chemical Society of Japan 50 (5), 1333-1336, 1977-05-01

  Oxford University Press (OUP)

キーワード

• General Chemistry

詳細情報

• CRID: 1360565169054108800
• NII論文ID: 130001970551
• DOI: 10.1246/bcsj.50.1333
• ISSN: 13480634
• ISSN: 00092673
• Web Site: https://academic.oup.com/bcsj/article-pdf/50/5/1333/56094205/bcsj.50.1333.pdf
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