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High temperature thermodynamic data of multiferroic ceramics based on BiFeO3 – BaTiO3 solid solutions

S. TANASESCU1,* , C. MARINESCU1, A. SOFRONIA1, A. IANCULESCU2

Affiliation

  1. Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, Splaiul Independentei 202, P.O. Box12-194, 060021 Bucharest, Romania
  2. Polytechnics University of Bucharest, 1-7 Gh. Polizu, P.O. Box 12-134, 011061 Bucharest, Romania

Abstract

The coexistence of ferroelectricity and antiferromagnetism/weak ferromagnetism is responsible for the original magnetoelastic and magnetoferroelectric properties of BiFeO3. In order to stabilize the single-phase composition and to improve the ferroelectric behaviour, the obtaining of binary solid solutions of BiFeO3 with other perovskite type compounds with better dielectric and ferroelectric characteristics, as BaTiO3 or PbTiO3 seems to be a suitable approach. Taking into account the actual trend to eliminate the lead compounds from the industrial applications, our research was focused to the investigation of multiferroic lead-free ceramics based on the (1-x)BiFeO3 - xBaTiO3 (0 £ x £ 0.30) solid solutions. The samples were characterized by X-ray diffraction as single perovskite phases. The microstructures examined by scanning electron microscopy showed homogeneous ceramic surfaces. Differential scanning calorimetry experiments were performed in the temperature range of 500-900oC in order to evidence the ferro-para phase transitions by a non-electrical method. Both the temperature and composition dependences of the specific heat capacity of the samples were determined and the variation of the Curie temperature with the composition was investigated. New features related to the thermodynamic stability of the multiferroic BiFeO3 - BaTiO3 ceramics were evidenced..

Keywords

Multiferroic ceramics, Perovskite, Thermodynamic properties, Defects.

Submitted at: Jan. 26, 2009
Accepted at: Aug. 7, 2009

Citation

S. TANASESCU, C. MARINESCU, A. SOFRONIA, A. IANCULESCU, High temperature thermodynamic data of multiferroic ceramics based on BiFeO3 – BaTiO3 solid solutions, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 8, pp. 1196-1201 (2009)