Electrocaloric effect and freezing temperature in(Pb_(0.8)Ba_(0.2))[(Zn_(1/3)Nb_(2/3))_(0.7)Ti_(0.3)]O_(3) relaxor ferroelectric ceramic  

作　　者：A.Peláiz-Barranco F.Calderón-Piñar Y.Mendez-González 

机构地区：[1]Facultadde Física-IMRE,Universidad de La Habana.San Lázaro y L,Vedado.La Habana 10400,Cuba

出　　处：《Journal of Advanced Dielectrics》2016年第3期1-4,共4页先进电介质学报（英文）

基　　金：The author wishes to thank to the Third World Academy of Sciences(RG/PHYS/LA No.99-050,02-225 and 05-043)for financial support and to ICTP for financial support of LatinAmerican Network of Ferroelectric Materials(NET-43).

摘　　要：The electrocaloric effect(ECE)is studied in(Pb_(0.8)Ba_(0.2))[(Zn_(1/3)Nb_(2/3))_(0.7)Ti_(0.3)]O_(3) relaxor ferroelectric ceramic by using an“indirect method”.The electric dependence for the polarization(hysteresis loops)has been obtained for several temperatures showing typical relaxor characteristics.The temperature change△T,which is associated with the ECE,is calculated by using the temperature dependence for the polarization.A maximum value for△T is observed for temperatures close above the freezing temperature,showing an indirect evidence of that critical temperature.The results are discussed considering the contribution of the polar nanoregions to the polarization.

关 键 词：RELAXORS FERROELECTRICS electrocaloric effect freezing temperature 

分 类 号：TQ1[化学工程]