Formation of rutile-type Ta(IV)O2 by shock reduction and cation-deficient Ta0.8O2 by subsequent oxidation |
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Authors: | Yasuhiko Syono Masae Kikuchi Tsuneaki Goto Kiyoto Fukuoka |
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Affiliation: | The Research Institute for Iron, Steel, and Other Metals, Tohoku University, Sendai 980, Japan |
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Abstract: | Ta2O5 is reduced to Ta(IV)O2 with the rutile structure by shock-loading to 50–60 GPa. Tetragonal unit cell parameters at room conditions are measured to be a = 4.7518(5)Å, c = 3.0878(4) Å, , and V = 69.72(1) Å3. The chemical composition is thermogravimetrically determined to be Ta0.97±0.04O2 by heating shock-reduced products in an oxygen gas flow to 1200°C. In the oxidation process a cation-deficient rutile-type compound Ta0.8O2 is found to be metastably formed. |
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