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

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Key Laboratory of Inorganic Functional Material and Device, CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences 

中国科学院无机功能材料与器件重点实验室   

  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 PbMg1/3Nb2/3O3 and PbSc1/2Nb1/2O3.  

  The main attention would be paid to NaNbO3-Sr0.5NbO3-LiNbO3 solid solutions and PbFe0.5Ta0.5O3ternary 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 Tm 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. 

 
 
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