CRYSTALLIZATION AND GLASS-FORMATION IN 50LI(2)O-CENTER-DOT-50NB(2)O(5) AND 25LI(2)O-CENTER-DOT-25NB(2)O(5)CENTER-DOT-50SIO(2)

Quenching of 50Li(2)O . 50Nb(2)O(5) melt was investigated with X-ray d iffraction (XRD) and surface morphological analysis, Glass formation o f 25Li(2)O . 25Nb(2)O(5) . 50SiO(2) and devitrification of LiNbO3 from the 25Li(2)O . 25Nb(2)O(5) . 50SiO(2) glass system were studied using DTA, XRD and electrolysis techniques, High quench rate yields smaller crystal grain size, lower crystallinity and mon LiNbO3 crystal dendri tic growth than the slow quenching. Three-fold symmetry was observed a nd a preferred crystallographic orientation of [0001] was confirmed fo r the quenched surfaces of LiNbO3. High Li+ mobility was observed in 2 5Li(2)O . 25Nb(2)O(5) . 50SiO(2) glass. By firing the 25Li(2)O . 25Nb( 2)O(5) . 50SiO(2) at 800 degrees C, glass ceramics of LiNbO3-SiO2 can be prepared.