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CRYSTAL GROWTH, STRUCTURE AND DIELECTRIC PROPERTIES OF FERROELECTRIC MIXED Pb2ScTaxNb1-xO6 SINGLE CRYSTALS

D. Doshkova1,* , D. Kaisheva1, B. Mihailova2, M. Gospodinov3

Affiliation

  1. South West University “Neophit Rilski”, 66 Ivan Mihailov Street, 2700 Blagoevgrad, Bulgaria
  2. Central Laboratory of Mineralogy and Crystallography, Bulgarian academy of Sciences, Acad. G. Bonchev Street, Building 107, 1113 Sofia, Bulgaria
  3. Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria

Abstract

Single crystals of a solid solution of the two ferroelectric compounds Pb2ScTaO6 (PST) and Pb2ScNbO6 (PSN) have been prepared by the high temperature solution method. They had the chemical formula Pb2ScTa0.48Nb0.52O6 (PST-PSN). X-ray diffraction analysis showed a perovskite type structure with a lattice parameter a = 4.0803 Å. The dielectric constant and dielectric losses were measured in temperature range -55 to 325 oC. At a 10 kHz measurement frequency, three peaks were observed at 15, 80 and 190 oC, corresponding to the phase transitions of PST, PST-PSN and PSN single crystals respectively..

Keywords

Perovskite ferroelectric relaxors, Crystal growth, Dielectric constant.

Submitted at: Dec. 9, 2004
Accepted at: Jan. 26, 2005

Citation

D. Doshkova, D. Kaisheva, B. Mihailova, M. Gospodinov, CRYSTAL GROWTH, STRUCTURE AND DIELECTRIC PROPERTIES OF FERROELECTRIC MIXED Pb2ScTaxNb1-xO6 SINGLE CRYSTALS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 1, pp. 447-450 (2005)