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Tunability characteristics of BaTiO3 – based ceramics: Modeling and experimental study

L. P. CURECHERIU1, F. M. TUFESCU1, A. IANCULESCU2, C. E. CIOMAGA1, L. MITOSERIU1,* , A. STANCU1

Affiliation

  1. Department of Solid State and Theoretical Physics, “Al. I. Cuza” University, Bv. Carol 11, Iasi, 700506, Romania
  2. Polytechnics Univ., 1-7 Gh. Polizu, P.O. Box 12-134, 011061 Bucharest, Romania

Abstract

The electric field dependence of the dielectric constant in ferroelectrics is described theoretically by means of the LandauGrinzburg-Devonshire (LGD) theory and by two approximations valid for low polarizations (Johnson’s equation and evenpower relation). While at low fields, all the approximations are describing well the tunability data, at high fields the LGD and Johnson’s equations are only providing realistic approaches for the experimental data. Tunability data in a large range of fields obtained for the BaTi0.9Zr0.1O3 ceramic at room temperature were well fitted by using the Johnson’s approximation in the overall range of field amplitudes. This was explained by the low values of the polarization caused by the mixed ferroelectric-relaxor character and by the proximity of the Curie range at room temperature..

Keywords

Ferroelectric, Tunability, Landau-Ginzburg-Devonshire model.

Submitted at: April 1, 2008
Accepted at: July 1, 2008

Citation

L. P. CURECHERIU, F. M. TUFESCU, A. IANCULESCU, C. E. CIOMAGA, L. MITOSERIU, A. STANCU, Tunability characteristics of BaTiO3 – based ceramics: Modeling and experimental study, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 7, pp. 1792-1795 (2008)