LiNbO_(3) single crystal has attracted considerable interest because of their usefulness in the fields of nonlinear and electro-optical applications.
In this study,we have grown the crystals of LiNbO_(3),LiNbO_(3):Fe,LiNbO_(3):Cu,LiNbO_(3):Fe+Cu from...
LiNbO_(3) single crystal has attracted considerable interest because of their usefulness in the fields of nonlinear and electro-optical applications.
In this study,we have grown the crystals of LiNbO_(3),LiNbO_(3):Fe,LiNbO_(3):Cu,LiNbO_(3):Fe+Cu from congruent melt in the RF furnace using Czochralski method and examined their physical properties,such as X-ray powder pattern,Laue pattern and frequency and temperature dependence of the dielectric constants and ac conductivities.
Optimal growing conditions are as follows:pulling rate of 2mm/hr,rotating rate of 24rpm and cooling rate of 15℃/hr near transition point. We have found that LiNbO_(3) single crystal undergo second order phase transition,its Curie constants are of an order of 10^(4) and the transition temperatures are 1135.2℃,1130.4℃,1137.9℃ and 1127.2℃,respectively. The frequency dependent ac conductivities in single crystals, in the range from 100Hz to 10MHz and from 200℃ to 400℃,well satisfy the universal power law.