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DIELECTRIC BEHAVIOR OF Sn DOPED AND ANNEALED FERROELECTRIC LEAD SCANDIUM TANTALATE SINGLE CRYSTALS

D. Kaisheva1,* , D. Doshkova1, 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

The growth conditions of undoped Pb2ScTaO6 (PST) and Pb2ScTaO6 doped with Sn (PST:Sn) ferroelectric single crystals, produced by the high temperature solution method, were optimized. Elemental analysis of the doped crystals revealed their composition – Pb1.89Sn0.11ScTaO6. X-ray diffraction analysis showed a perovskite type structure with a Pm3m space group and a lattice parameter a = 4.0749 Å. The influence of thermal treatment (annealing) and doping effects on the dielectric constant, dielectric losses and the real part of the conductivity have been investigated in the temperature range –30 to 200oC, and in the frequency range 10 kHz to 1 MHz. The values of the dielectric constant of the PST crystals remained the same after thermal annealing, whereas they decreased after Sn doping in the phase transition temperature range of the PST single crystals. The real part of the conductivity rose with increasing temperature for all samples investigated..

Keywords

Relaxor ferroelectrics, Dielectric constant, AC- conductivity.

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

Citation

D. Kaisheva, D. Doshkova, B. Mihailova, M. Gospodinov, DIELECTRIC BEHAVIOR OF Sn DOPED AND ANNEALED FERROELECTRIC LEAD SCANDIUM TANTALATE SINGLE CRYSTALS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 1, pp. 443-446 (2005)