Crystallization kinetics and structural change during crystallization of th
e (100 - x)(0.6Li(2)S . 0.4SiS(2)) . xLi(3)PO(4) oxysulfide glasses were in
vestigated. The activation energies, E-a, for crystal growth estimated by t
he modified Kissinger equation ranged from 168 to 447 kJ/mol. The compositi
on dependence of E-a showed opposite variation to that of the difference in
the temperatures of crystallization and glass transition. This inverse cor
relation was explained in terms of the fragility of the oxysulfide system.
Solid-state nuclear magnetic resonance (NMR) measurements revealed that the
silicon and phosphorus atoms coordinated with both sulfur and oxygen atoms
present in the oxysulfide glasses were not detected after crystallization.
Relationship between the thermal stability of these glasses and the magnit
ude of the structural change during crystallization is discussed. (C) 2000
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