Studies on formation mechanism and kinetics process for PMN perovskite in columbite method

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 dec...

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Bibliographic Details
Main Authors: Junming Xue, Chengen Li, Huanyao Ni, Zhiwen Yin
Format: Conference Proceeding
Language:English
Subjects:
Calcination
Ceramics
Dielectrics
Electrostriction
Kinetic theory
Magnesium
Niobium compounds
Powders
Temperature
X-ray scattering
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Summary: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 P/sub 3/N/sub 2/ 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.
DOI:10.1109/ISE.1996.578227