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The solid‐state reaction between TeO2 and Nb2O5 was studied by means of X‐ray powder diffraction, at room temperature, using samples prepared in the interval of 500°C to 850°C. Several whitish coloured stable mixed oxide phases have been found, corresponding to the formulas TeO2 · 3Nb2O5, 3TeO2 · Nb2O5 and 4TeO2 · Nb2O5. The phase distribution differs from that in TeO2V2O5 and TeO2Ta2O5 systems and no isomorphism relationships with phases in these oxide systems have been noticed.
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G. Petrini (1980) studied this question.
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