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Growth of ferroelectric Pb2ScTaO6 single crystals in oxygen and hydrogen atmospheres, and investigation of their dielectric properties

A. AMOVA-KOSTOVA1, M. VELEVA2, V. MARINOVA3,*

Affiliation

  1. University of Architecture, Civil Engineering and Geodesy, Ch. Smirnenski Blvd.1, 1046 Sofia, Bulgaria
  2. Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
  3. Central Laboratory Optical Storage and Processing of Information, Bulgarian Academy of Sciences, Acad. G. Bonchev Str,bl.101, 1113 Sofia, Bulgaria

Abstract

Pb2ScTaO6 single crystals are obtained by a high-temperature solution growth method, using a flux of composition PbO:PbF2:B2O3=0.85:0.13:0.02. The crystal growth process is performed in the temperature range 1200 °С – 900 °С, in two steps with different gas atmospheres during the low temperature step. The dielectric measurements are performed in the frequency range 10 kHz – 1 MHz and the temperature range minus 40 °С to 60 °С. It is found that crystals prepared in oxygen and mixed oxygen/hydrogen atmosphere conditions possess more relaxor type behavior, with a diffuse ferroelectric phase transition at a lower temperature. Moreover the frequency dependence of the dielectric properties is stronger in these crystals..

Keywords

Single crystals, Dielectric properties, Relaxor behaviour.

Submitted at: Nov. 3, 2006
Accepted at: Feb. 15, 2007

Citation

A. AMOVA-KOSTOVA, M. VELEVA, V. MARINOVA, Growth of ferroelectric Pb2ScTaO6 single crystals in oxygen and hydrogen atmospheres, and investigation of their dielectric properties, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 2, pp. 268-270 (2007)