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DOI: 10.1039/A900788A (Paper) Reference Section for: J. Mater. Chem., 1999, 9, 1785-1788

Equilibrium and non-equilibrium phase diagram within the TeO2-rich part of the TeO2-Nb2O5 system

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Stéphanie Blanchandin, Philippe Thomas, Pascal Marchet, Jean Claude Champarnaud-Mesjard and Bernard Frit

Abstract

The TeO2-rich part of the TeO2-Nb2O5 system has been investigated by temperature programmed X-ray diffraction and differential scanning calorimetry. Three invariant equilibria have been observed: one eutectic reaction (8 mol% NbO2.5, TE=690±5[thin space (1/6-em)]°C, LE TeO2+Nb2Te4O13), one peritectic reaction (incongruent melting, at 766±5[thin space (1/6-em)]°C, of the Nb2Te4O13 compound) and one congruent melting reaction (congruent melting, at 810±5[thin space (1/6-em)]°C, of the Nb2Te3O11 compound). A large glass-forming domain has been evidenced (0 to 25 mol% NbO2.5). The thermal behaviour of these glasses has been followed. The glass transition, crystallization temperatures and the nature of crystalline phases formed have been determined.

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