Compositional variation in 0.65 PbMg2/3Nb1/3O3 -0.35 PbTiO3 single crystals grown by high temperature solution growth technique by I. Bhaumik, G. Tiwari, S. Ganesamoorthy, A. K. Karnal, M. K. Singh, and V. S. Tiwari

Crystal Research and Technology

Cryst. Res. Technol. 42, 356 (2007) - Abstract -

Compositional variation in 0.65 PbMg_2/3Nb_1/3O₃ -0.35 PbTiO₃ single crystals grown by high temperature solution growth technique

I. Bhaumik, G. Singh, S. Ganesamoorthy, A. K. Karnal, M. K. Tiwari*, and V. S. Tiwari

Laser Materials Development and Devices Division, Raja Ramanna Centre for Advanced Technology, Indore – 452 013, India
*Synchrotron Utilisation Division, Raja Ramanna Centre for Advanced Technology, Indore– 452 013, India

Keywords	ferroelectrics, dielectric response, PMN-PT, flux growth
PACS	77.84.-s, 81.10.Dn
DOI	10.1002/crat.200610828

Single crystals of lead magnesium niobate titanate, 0.65 PbMg_2/3Nb_1/3O₃ (PMN) -0.35 PbTiO₃ (PT) were grown using flux method near morphotropic phase boundary (MPB) composition. The crystals grown at the centre of the platinum crucible were found to PT deficient compared to those grown near the walls of the crucibles. A variation of ~3.8mol% in PT concentration was found in the crystals grown at the wall and at the centre of the crucible. The difference in the chemical composition of crystals grown at the centre and the near the wall of the crucible was observed by x-ray diffraction, EDXRF, Dielectric and thermal measurements. The presence of PT rich and deficient crystals is explained in terms of the segregation coefficient of PT in PMN.

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