Relaxor-like properties of some lead-free and lead-containing perovskites 

　　Prof.  Igor Raevski 

　　Southern Federal University,  

　　Faculty of Physics and Research Institute of Physics 

　　Rostov-on-Don, Russia 

　　时间：2016年11月25日（星期五）下午14:00 

　　　　地点： 4 号楼 14楼第一会议室 

　　联系人： 曾江涛   副研究员 

　　        李国荣   研究员 

　　欢迎各位老师同学光临! 

　　Some lead-free and lead-containing perovskites exhibit a relaxor-like behavior. The scope of this presentation is the systematic comparison of their properties with those of canonical lead-containing relaxors, such as PbMg_1/3Nb_2/3O₃ and PbSc_1/2Nb_1/2O₃.  

　　The main attention would be paid to NaNbO₃-Sr_0.5NbO₃-LiNbO₃ solid solutions and PbFe_0.5Ta_0.5O₃ ternary perovskite. Both these materials exhibit some features characteristic of relaxors, namely fulfilment of quadratic and linear Curie-Weiss laws for ε' just above and well above the temperature T_m of ε’(T) peak respectively, the Vogel-Fulcher scaling of both ε’(T) and ε”(T) peaks. However a lot of differences were revealed as compared with the properties of canonical relaxors.