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Reaction kinetics, sintering characteristics, and ordering behavior of microwave dielectrics: Barium magnesium tantalate

Published online by Cambridge University Press:  31 January 2011

Chung-Hsin Lu  and
Chien-Cheng Tsai
Chung-Hsin Lu
Affiliation:
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China
Chien-Cheng Tsai
Affiliation:
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China
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Abstract

The formation process of Ba(Mg1/3Ta2/3)O3 was confirmed to be a direct reaction between constituent compounds without the presence of intermediate compounds. Isothermal analysis of reaction kinetics indicated the controlling reaction to be a three-dimensional diffusion process. Based on the Ginstling–Brounshtein model, the activation energy of the formation process was estimated to be 257 kJ/mol. A new definition of the ordering parameter for Ba(Mg1/3Ta2/3)O3 was deduced to quantitatively evaluate the ordering degree. Raising sintering temperatures resulted in an increase in the ordering degree and bulk density of Ba(Mg1/3Ta2/3)O3. Reducing the barium content in Ba(Mg1/3Ta2/3)O3 substantially resulted in improved densification and enhanced ordering structure. On the other hand, an excess barium content in specimens hindered the progress of sintering, and also induced the disordering structure.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 5 , May 1996 , pp. 1219 - 1227
Copyright
Copyright © Materials Research Society 1996

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