Debye's temperature and heat capacity for Sr_(0.15)Ba_(0.85)Bi_(2)Nb_(2)O_(9) relaxor ferroelectric ceramic  

作　　者：A.Pelaiz-Barranco Y.Gonzalez-Abreu P.Saint-Gregoire J.D.S.Guerra F.Calderón-Piñar 

机构地区：[1]Facultad de Fisica-IMRE,Universidad de La Habana San Lazaro y L,Vedado,LaHabana 10400,Cuba [2]Department of Sciences and Arts,University of Nîmes 30021 Nîmes Cedex 01,France [3]Grupo de Ferroeletricos e Materiais Multifuncionais,Instituto de Fisica Universidade Federal de Uberlandia.38400-902,Uberlandia-MG,Brazil

出　　处：《Journal of Advanced Dielectrics》2016年第1期1-4,共4页先进电介质学报（英文）

基　　金：The authors wish to express their thanks to the Third World Academy of Sciences(RG/PHYS/LA Nos.99-050,02-225 and 05-043);to ICTP,Trieste,Italy,for the financial support of Latin-American Network of Ferroelectric Materials(NET-43).Thanks to CNPq and FAPEMIG agencies from Brazil.APB acknowledges to the Conseil Regional Languedoc-Roussillon for her invitation to the University of Nîmes,France.Thanks to the Embassy of France in Havana,Cuba,for financial support for the scientific cooperation between the University of Nîmes and the Havana University。

摘　　要：A lead-free relaxor ferroelectric,Sr_(0.15)Ba_(0.85)Bi_(2)Nb_(2)O_(9),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 500 Hz and 5 MHz 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.

关 键 词：RELAXORS FERROELECTRICS heat capacity CERAMICS 

分 类 号：O48[理学—固体物理]