Processes in the reaction of Y2O3 with WO3.
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概要
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The processes of the solid state reaction of Y<SUB>2</SUB>O<SUB>3</SUB> with WO<SUB>3</SUB> were studied for samples mixed in the molar ratios of Y<SUB>2</SUB>O<SUB>3</SUB> : WO<SUB>3</SUB>=1 : 3, 1 : 1, 7 : 4, 5 : 2, and 3 : 1. It was found that all the reactions except Y<SUB>2</SUB>O<SUB>3</SUB> : WO<SUB>3</SUB>= 5 : 2 from the powders of both Y<SUB>2</SUB>O<SUB>3</SUB> and WO<SUB>3</SUB> in air proceeded according to the following order step reactions: Y<SUB>2</SUB>O<SUB>3</SUB>·3WO<SUB>3</SUB>→Y<SUB>2</SUB>O<SUB>3</SUB>·WO<SUB>3</SUB>→7Y<SUB>2</SUB>O<SUB>3</SUB>·4WO<SUB>3</SUB>→5Y<SUB>2</SUB>O<SUB>3</SUB>·2WO<SUB>3</SUB> and 5Y<SUB>2</SUB>O<SUB>3</SUB>·2WO<SUB>3</SUB>→3Y<SUB>2</SUB>O<SUB>3</SUB>·WO<SUB>3</SUB>, with temperatures rising from 600 to 1300 °C and with an unknown compound, X, always first formed below 700 °C. In a reaction couple in contact with both Y<SUB>2</SUB>O<SUB>3</SUB> and WO<SUB>3</SUB> pellets, WO<SUB>3</SUB> components preferentially diffused to the Y<SUB>2</SUB>O<SUB>3</SUB> side to form Y<SUB>2</SUB>O<SUB>3</SUB>·3WO<SUB>3</SUB> (orthorhombic form) on the boundary between them at 1000 °C.
- 公益社団法人 日本化学会の論文
著者
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SATA Toshiyuki
Research Laboratory of Engineering Materials, Tokyo Institute of Technology
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Sata Toshiyuki
Research Laboratory Of Engineering Materials Tokyo Institute Of Technology
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Kuribayashi Kiyoshi
Research Laboratory of Engineering Materials, Tokyo Institute of Technology
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