Phase Transition Kinetics in Bi3NbO7 Evaluated by in situ Isothermal Conductivity Measurements  

作　　者：王先平 程帜军 方前锋 

机构地区：[1]Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031

出　　处：《Chinese Physics Letters》2007年第4期1013-1016,共4页中国物理快报（英文版）

摘　　要：Kinetics of phase transformation from pseudocubic to tetragonal phase in Bi3NbO7 solid solution is studied by using the ac impedance method under isothermal conditions. Conductivity of the investigated compound is used to characterize the kinetic process of the transition. The Avrami exponent and the activation energy of phase transition are around 1.5 and 3.5eV, respectively. These kinetic parameters reveal that the pseudocubic-tetragonal transition in Bi3NbO7 .belongs to a three-dimensional diffusion-controlled growth with zero nucleation rate.Kinetics of phase transformation from pseudocubic to tetragonal phase in Bi3NbO7 solid solution is studied by using the ac impedance method under isothermal conditions. Conductivity of the investigated compound is used to characterize the kinetic process of the transition. The Avrami exponent and the activation energy of phase transition are around 1.5 and 3.5eV, respectively. These kinetic parameters reveal that the pseudocubic-tetragonal transition in Bi3NbO7 .belongs to a three-dimensional diffusion-controlled growth with zero nucleation rate.

关 键 词：BI2O3-NB2O5 SOLID-SOLUTION OXIDE-ION CONDUCTORS X-RAY-DIFFRACTION CRYSTALLIZATION KINETICS ELECTRICAL-CONDUCTIVITY SYSTEM TRANSFORMATION ELECTROLYTES BI2O3-TA2O5 BI2O3-MOO3 

分 类 号：O46[理学—电子物理学]