Author(s)

Alexander Niemer, Rainer Pankrath, Klaus Betzler, Manfred Burianek, Manfred Muehlberg

Department of Physics, University of Osnabrück, Osnabrück, Germany.
Institute of Crystallography, University of Cologne, Cologne, Germany.

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.

77.80.-e Ferroelectricity and Antiferroelectricity; 77.80.Jk Relaxor Ferroelectrics; 77.84.Ek Niobates and Tantalates; 77.22.Ch Permittivity (Dielectric Function)

A. Niemer, R. Pankrath, K. Betzler, M. Burianek and M. Muehlberg, "Dielectric Properties and the Phase Transition of Pure and Cerium Doped Calcium-Barium-Niobate," World Journal of Condensed Matter Physics, Vol. 2 No. 2, 2012, pp. 80-84. doi: 10.4236/wjcmp.2012.22014.