Equilibrium and non-equilibrium phase diagram within the TeO2-rich part of the TeO2-Nb2O5 system
Abstract
The TeO
2
-rich part of the TeO
2
-Nb
2
O
5
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% NbO
2.5
, T
E
=690±5 °C, L
E
TeO
2
+Nb
2
Te
4
O
13
), one peritectic reaction (incongruent melting, at 766±5 °C, of the Nb
2
Te
4
O
13
compound) and one congruent melting reaction (congruent melting, at 810±5 °C, of the Nb
2
Te
3
O
11
compound). A large glass-forming domain has been evidenced (0 to 25 mol% NbO
2.5
). The thermal behaviour of these glasses has been followed. The glass transition, crystallization temperatures and the nature of crystalline phases formed have been determined.
Please wait while we load your content...
