Thermodynamic Stability and Mechanisms of Formation and Decomposition of Perovskite Pb(Zn1/3Nb2/3)O3Prepared by the PbO Flux Method
作者:
Hyun M. Jang,
S. Hoon Oh,
Jong H. Moon,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 1
页码: 82-88
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb05446.x
出版商: Blackwell Publishing Ltd
关键词: lead;zinc;niobates;perovskites;pyrochlore
数据来源: WILEY
摘要:
The mechanisms of formation and decomposition of the ferroelectric perovskite PZN [Pb(Zn1/3Nb2/3)O3] were examined. The formation of perovskite PZN from the excess molten PbO environment is characterized by an inititial rapid formation of pyrochlore phase, followed by a subsequent reaction between the intermediate pyrochlore phase, ZnO, and liquid PbO to produce perovskite phase. The pure perovskite PZN crystal prepared by the PbO flux method is thermodynamically unstable over a wide range of temperature (600° to 1400°C), yielding pyrochlore phase and PbO as the decomposition products. The decomposition reaction of perovskite PZN proceeded uniformly with a spatial homogeneity throughout the specimen. The estimated activation energy of the decomposition reaction is approximatley 18 kcal/mo
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