The development of Bi Fe O_3-based ceramics  

作　　者：Ahmad Hussain Xijun Xu Guoliang Yuan Yiping Wang Ying Yang Jiang Yin Junming Liu Zhiguo Liu 

机构地区：[1]School of Materials Science and Engineering, Nanjing University of Science and Technology [2]National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University [3]Precision Driving Laboratory, Nanjing University of Aeronautics and Astronautics

出　　处：《Chinese Science Bulletin》2014年第36期5161-5169,共9页

基　　金：supported by the National Basic Research Program of China(2012CB619406);the National Natural Science Foundation of China(11134004,51177072 and 11274174);the Fundamental Research Funds for the Central Universities(30920130111018)

摘　　要：The multiferroic properties of Bi Fe O3-based ceramics were improved through optimizing their sintering method and doping with certain rare earth elements in pure Bi Fe O3. Some methods, especially liquid-phase sintering method has largely decreased the densities of oxygen vacancies and Fe2in Bi Fe O3-based ceramics, and thus their resistivity became high enough to measure the saturated polarization and the large piezoelectric d33 coefficient under the high electric field of [150 k V/cm. Besides,multiferroic properties were improved through the rare earth elements' doping in pure Bi Fe O3. Magnetization commonly increases with the proportional increase of Nd,La, Sm and Dy contents up to *30 %, while ferroelectric phase can transform to paraelectric phase at a certain proportion. An improved magnetoelectric coupling was often observed at ferroelectric phase with a relatively large proportion. Besides, an enhanced piezoelectric coefficient is expected in Bi Fe O3-based ceramics with morphotropic phase boundaries as they are already observed in thin epitaxial Bi Fe O3 films.The multiferroic properties of Bi Fe O3-based ceramics were improved through optimizing their sintering method and doping with certain rare earth elements in pure Bi Fe O3. Some methods, especially liquid-phase sintering method has largely decreased the densities of oxygen vacancies and Fe2in Bi Fe O3-based ceramics, and thus their resistivity became high enough to measure the saturated polarization and the large piezoelectric d33 coefficient under the high electric field of [150 k V/cm. Besides,multiferroic properties were improved through the rare earth elements’ doping in pure Bi Fe O3. Magnetization commonly increases with the proportional increase of Nd,La, Sm and Dy contents up to ＊30 %, while ferroelectric phase can transform to paraelectric phase at a certain proportion. An improved magnetoelectric coupling was often observed at ferroelectric phase with a relatively large proportion. Besides, an enhanced piezoelectric coefficient is expected in Bi Fe O3-based ceramics with morphotropic phase boundaries as they are already observed in thin epitaxial Bi Fe O3 films.

关 键 词：O3 FE 陶瓷 纯铋 稀土元素掺杂 液相烧结法 压电系数 铁电相 

分 类 号：TQ174.1[化学工程—陶瓷工业]