Debye’s temperature and heat capacity for Sr0.15Ba0.85Bi2Nb2O9 relaxor ferroelectric ceramic

Journal of Advanced Dielectrics

P. Saint-Grégoire¹  F. Calderón-Piñar²  A. Peláiz-Barranco²  Y. González-Abreu²  J. D. S. Guerra³ 

[1] Department of Sciences and Arts, University of Nîmes, 30021 Nîmes Cedex 01, France;Facultad de Física-IMRE, Universidad de La Habana, San Lázaro y L, Vedado, La Habana 10400, Cuba;Grupo de Ferroelétricos e Materiais Multifuncionais, Instituto de Física, Universidade Federal de Uberlândia. 38400-902, Uberlândia - MG, Brazil;

关键词: Relaxors;    ferroelectrics;    heat capacity;    ceramics;   

DOI  :  10.1142/S2010135X16200010

来源: DOAJ

【 摘 要 】

A lead-free relaxor ferroelectric, Sr0.15Ba0.85Bi2Nb2O9, was synthesized via solid-state reaction and the temperature-dependence of the heat capacity was measured in a wide temperature range. The dielectric permittivity was also measured between 500Hz and 5MHz in the same temperature range. No anomaly has been detected in the heat capacity curve for the whole temperature range covered in the present experiments, while broad peaks have been observed in the dielectric permittivity with high frequency dispersion. A typical relaxor behavior has been observed from the dielectric analysis. The Debye’s temperature has showed a minimum value near the freezing temperature. The results are discussed considering the spin-glass model and the high frequency dispersion, which has been observed for the studied relaxor system.

【 授权许可】

Unknown