초록 열기/닫기 버튼
The thermal stabilities and formation kinetics of K[Nb1/3Te2/3]2O4.8 phase in K2O-Nb2O5-TeO2 glasses were investigated. The activation energies for crystallization and grain growth of the K[Nb1/3Te2/3]2O4.8 phase from original glasses were determined from the results of XRD and DTA data. Transparent 15K2O-15Nb2O5-70TeO2 glass-ceramics have a cubic structure basically, but the cubic structure is very slightly distorted. The activation energy for grain growth of the K[Nb1/3Te2/3]2O4.8 phase in 15K2O-15Nb2O5-70TeO2 glass was 33.5 kJ/mol. The energy required for the phase transformation from 15K2O-15Nb2O5- 70TeO2 glass to K[Nb1/3Te2/3]2O4.8 was 253.6 kJ/mol. The study on the formation kinetics of transparent glass-ceramics with SHG should have a large impact for the development of nonlinear optical materials.
