Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (02): 109-114.doi: 10.3866/PKU.WHXB20030204

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AC Impedance Characterization for Microwave Dielectric Material BaEu2Ti4O12

Jing Xi-Ping;Anthony R. West   

  1. State Key Laboratory of Rare Earth Materials Chemistry and Application, College of Chemistry and Molecular Engineering, Peking University, Beijing　100871;Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD,UK
  • Received:2002-05-07 Revised:2002-06-27 Published:2003-02-15
  • Contact: Jing Xi-Ping E-mail:xpjing@chem.pku.edu.cn

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Abstract: The electrical properties of BaEu2Ti4O12 were characterized by means of AC impedance spectroscopy in the frequency rang of 10－1～107 Hz. The experiment results indicate: (i) the permittivity value measured in this low frequency range is compatible with the published value measured in microwave range. The permittivity value obtained in high frequency range is net effect of bulk and grain boundary permittivitis; better-sintered ceramic has thinner grain boundary and may have larger permittivity value; (ii) when the sample was cooled down slowly from elevated temperature or annealed in O2-rich atmosphere, the conductivity was reduced, which may be explained by the reduction of oxygen vacancies in crystal. These treatments may lower the dielectric loss in microwave range.

Key words: AC impedance, BaEu2Ti4O12, Microwave dielectric