Crystal Growth and Some Properties of Lead Indium Niobate-Lead Titanate Single Crystals Produced by Solution Bridgman Method

A single crystal about 15 mm in diameter and 10 mm in length of the lead indium niobate-lead titanate, (1 - x)Pb(In1/2Nb1/2)O-3-xPbTiO(3)[PIN-PT(1 - x/x)] solid solution system near a morphoiropic phase boundary was obtained by the solution Bridgman, method using PbO-B2O3 flux. X-ray diffraction study reveals that the ingot cut perpendicularly to the cylindrical as-grown PIN-PT(63/37)(the starting composition) single crystal length exhibits the (110) plane of the perovskite phase, and the wafers cut 2 mm and 10 mm from the bottom of the cylindrical PIN-PT single crystal exhibit the rhombohedral phase and tetragonal one at room temperature, respectively. The crystal growth was almost along the [110] direction. The Ti contents x of these wafers cut at 2 mm and at 10 mm were determined by Inductive Charge Plasma (ICP) chemical analysis to be 6.31 and 0.35, respectively. The Ti content of the as-grown PIN-PT(63/37)(the starting composition) single crystal was found to increase with growth away from the nucleation point. For x = 0.31, the relative pen-nittivity epsilon(r) has a peak (37000 at 10 kHz) at the Curie temperature T-c, 300degreesC and then a shoulder at the ferroelectric rhombohedral to tetragonal phase transition temperature, 120degreesC with cooling. For x = 0.35; the epsilon(r) has a peak (25000 at 10 kHz) at T-c, 313degreesC. [DOI: 10. 1443/JJAP.41.7007].