Dielectric properties of bismuth-containing pyrochlores:A comparative analysis  

作　　者：M.V.Talanov E.V.Glazunova V.I.Kozlov S.P.Kubrin A.A.Bush V.M.Talanov K.E.Kamentsev 

机构地区：[1]Research Institute of Physics Southern Federal University,av.Stachki 193 Rostov-on-Don,344090,Russia [2]Research Institute of Solid State Electronics Materials MIREA-Russian Technological University(RTU MIREA)5th Street of Sokolinaya Gora 22 Moscow,119454,Russia [3]Technological Department Platov South-Russian State Polytechnic University(NPI)Prosvescheniya Str.132,Novocherkassk 346428,Russia

出　　处：《Journal of Advanced Dielectrics》2022年第2期29-35,共7页先进电介质学报（英文）

基　　金：The authors are grateful to L.A.Shilkina for X-ray phase analysis of the BZN samples.The reported study was funded by Russian Science Foundation(RSF)-research projects no.20-72-00086(BZN ceramics preparation,dielectric mea-surements);At RTU MIREA,the work was supported by the Ministry of Science and Higher Education of Russia(project FSFZ 0706-2020-2022,Bi2Ti2O7 single crystal growth),the equipment of the Center for Collective Use of RTU MIREA was used.

摘　　要：The comparative analysis of the dielectric properties of bismuth-containing pyrochlores with different manifestation of atomic order/disorder was carried out.We examined the dielectric properties(including behavior in electric fields)of two pyrochlore compounds:BZN(presumably a composition close to Bi_(1.5)Zn_(0.5)Nb_(1.5)O_(6.5))ceramics with chemical disorder in both A and B cation sublattices and Bi_(2)Ti_(2)O_(7)single crystal with fully chemical ordered structure.The fundamental differences between the dielectric properties of the BZN ceramics and Bi_(2)Ti_(2)O_(7)single crystal were shown.In particular,in the dielectric relaxation behavior(which cannot be described via Arrhenius law in the Bi_(2)Ti_(2)O_(7))or in the influence of the electric fields on the dielectric permittivity(split-ting of the field-cooled and zero-field-cooled behaviors was observed for Bi_(2)Ti_(2)O_(7)below estimated freezing temperature).The results of this study highlights the special role of Bi_(2)Ti_(2)O_(7)as a candidate material for studying aspects of geometric frustration related with pyrochlore structure in non-magnetic medium and specifies the future directions of research.

关 键 词：PYROCHLORES relaxor behavior bismuth titanate dielectric permittivity geometric frustration 

分 类 号：TQ174[化学工程—陶瓷工业]