Mossbauer and magnetization studies of magnetic phase transitions in 0.5BiFeO_(3)-0.5NaNbO_(3)and 0.5LaFeO_(3)-0.5NaNbO_(3)solid solutions  

作　　者：S.I.Raevskaya S.P.Kubrin Jian Zhuang I.P.Raevski M.A.Malitskaya I.N.Zakharchenko M.S.Panchelyuga V.V.Titov 

机构地区：[1]Research Institute of Physics and Faculty of Physics Southern Federal University,Rostov-on-Don 344090,Russia [2]Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education and International Center for Dielectric Research,Xi’an Jiaotong University Xi’an 710049,P.R.China [3]Institute of Theoretical and Experimental Biophysics Russian Academy of Sciences,Pushchino Moscow Region 142290,Russia

出　　处：《Journal of Advanced Dielectrics》2020年第1期28-33,共6页先进电介质学报（英文）

基　　金：This work was supported by RFBR and NSFC,project 19-52-53030 GFEN a and by the Ministry of Education and Science of the Russian Federation(State assignment in the field of scientific activity,Southern Federal University,2020).

摘　　要：0.5AFeO_(3)-0.5NaNbO_(3)(A=Bi,La)solid solution compositions were prepared using a solid phase reaction route from high-purity starting oxides.Mossbauer studies have shown that while for 0.5BiFeO_(3)-0.5NaNbO_(3)the magnetic phase transition temperature T_(M) value is about 150 K,for 0.5LaFeO_(3)-0.5NaNbO_(3),it is only≈25 K.This dramatic difference in T_(M) values seems to be due to additional contribution of the magnetic superexchange between Fe^(3+)ions via the empty 6p-states of Bi^(3+)ions to the overall superexchange.

关 键 词：MULTIFERROIC magnetic phase transition BiFeO_(3) magnetic superexchange 

分 类 号：TG1[金属学及工艺—金属学]