Summary
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1.
X-ray powder patterns have been used to determine the structure of products obtained by roasting 12-phosphorotungstic and 12-silicotungstic acids in air at 700°.
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2.
Both products are isomorphic and at room temperature they have the structure of the high-temperature tetragonal modification of tungsten trioxide (WO3).
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Babad-Zakhryapin, A.A., Gorbunov, N.S. The structure of products obtained by roasting some 12-reteropoly acids. Russ Chem Bull 12, 10–12 (1963). https://doi.org/10.1007/BF00846941
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DOI: https://doi.org/10.1007/BF00846941