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Dielectric Properties and the Phase Transition of Pure and Cerium Doped Calcium-Barium-Niobate
Department of Physics, University of Osnabrück, Osnabrück, Germany
Department of Physics, University of Osnabrück, Osnabrück, Germany
Department of Physics, University of Osnabrück, Osnabrück, Germany
Institute of Crystallography, University of Cologne, Cologne, Germany
Institute of Crystallography, University of Cologne, Cologne, Germany
- 1 Department of Physics, University of Osnabrück, Osnabrück, Germany
- 2 Department of Physics, University of Osnabrück, Osnabrück, Germany
- 3 Department of Physics, University of Osnabrück, Osnabrück, Germany
- 4 Institute of Crystallography, University of Cologne, Cologne, Germany
- 5 Institute of Crystallography, University of Cologne, Cologne, Germany
World Journal of Condensed Matter Physics·Volume 02 (2012)·Pages 80–84·Published 17 May 2012·DOI10.4236/wjcmp.2012.22014
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Abstract
The complex dielectric constant of pure and cerium doped calcium-barium-niobate (CBN) was studied at frequencies 20 Hz ≤ f ≤ 1 MHz in the temperature range 300 K ≤ T ≤ 650 K and compared with the results for the well known ferroelectric relaxor strontium-barium-niobate (SBN). By the analysis of the systematically taken temperature and frequency dependent measurements of the dielectric constant the phase transition characteristic of the investigated materials was evaluated. From the results it must be assumed that CBN shows a slightly diffuse phase transition without relaxor behavior. Doping with cerium yields a definitely different phase transition characteristic with some indications for a relaxor type ferroelectric material, which are common from SBN.
Keywords77.80.-e Ferroelectricity and Antiferroelectricity77.80.Jk Relaxor Ferroelectrics77.84.Ek Niobates and Tantalates77.22.Ch Permittivity (Dielectric Function)
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