Non-isothermal crystallization kinetics of V 2 O 5-MoO 3-Bi 2 O 3 glasses (original) (raw)

Characteristic temperatures, such as T g (glass transition), T x (crystallization temperature) and T l (liquidus temperature) of glasses from the V 2 O 5 -MoO 3 -Bi 2 O 3 system were determined by means of differential thermal analysis (DTA). The higher content of MoO 3 improved the thermal stability of the glasses as well as the glass forming ability. The non-isothermal crystallization was investigated and following energies of the crystal growth were obtained: glass #1 (80V 2 O 5 ·20Bi 2 O 3 ) E G =280 kJ mol -1 , glass #2 (40V 2 O 5 ·30MoO 3 ·30Bi 2 O 3 ) E G =422 kJ mol -1 and glass #3 (80MoO 3 ·10V 2 O 5 ·10Bi 2 O 3 ) E G =305 kJ mol -1 . The crystallization mechanism of glass #1 (n=3) is bulk, of glass #3 (n=1) is surface. Bulk and surface crystallization was supposed in glass #2. The presence of high content of a vanadium oxide acts as a nucleation agent and facilitates bulk crystallization.