Title :
Studies on formation mechanism and kinetics process for PMN perovskite in columbite method
Author :
Xue, Junming ; Li, Chengen ; Ni, Huanyao ; Yin, Zhiwen
Author_Institution :
Inst. of Ceramics, Acad. Sinica, Shanghai, China
Abstract :
Formation mechanism and kinetics process of PbO+MN system were investigated in this paper. The formation of perovskite phase in this system was characterized by an initial rapid formation of Mg-contained pyrochlore phase. This pyrochlore not only reacted with MgO to form PMN perovskite, but also decomposed itself to be P3N2 pyrochlore. The kinetics process of the system could be divided into two stages: short stage and long stage, and their activation energy were 160 KJ/mol and 182 KJ/mol respectively
Keywords :
ceramics; dielectric materials; lead compounds; magnesium compounds; solid-state phase transformations; PMN; PbMgO3NbO3; activation energy; columbite method; formation; kinetics; perovskite phase; pyrochlore phase; Calcination; Ceramics; Dielectrics; Electrostriction; Kinetic theory; Magnesium; Niobium compounds; Powders; Temperature; X-ray scattering;
Conference_Titel :
Electrets, 1996. (ISE 9), 9th International Symposium on
Conference_Location :
Shanghai
Print_ISBN :
0-7803-2695-4
DOI :
10.1109/ISE.1996.578227
