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Effects of PbO excess in Pb(Mg1/3Nb2/3)O3–PbTiO3 ceramics: Part II. Microstructure development

Published online by Cambridge University Press:  31 January 2011

M. Villegas ,
J. F. Fernáandez ,
A. C. Caballero ,
Z. Samardija ,
G. Drazic  and
M. Kosec
M. Villegas
Affiliation:
Electroceramics Department, Instituto de Ceráamica y Vidrio, CSIC, 28500 Arganda del Rey, Madrid, Spain
J. F. Fernáandez
Affiliation:
Electroceramics Department, Instituto de Ceráamica y Vidrio, CSIC, 28500 Arganda del Rey, Madrid, Spain
A. C. Caballero
Affiliation:
Electroceramics Department, Instituto de Ceráamica y Vidrio, CSIC, 28500 Arganda del Rey, Madrid, Spain
Z. Samardija
Affiliation:
Ceramics Department, Jozef Stefan Institute, Slovenia
G. Drazic
Affiliation:
Ceramics Department, Jozef Stefan Institute, Slovenia
M. Kosec
Affiliation:
Ceramics Department, Jozef Stefan Institute, Slovenia
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Abstract

The microstructure evolution of Pb(Mg1/3Nb2/3)O3 –PbTiO3 (PMN-PT) based ceramics has been investigated to determine the influence of the presence of PbO content in excess of stoichiometric values. The microstructure of the different materials showed a different evolution of secondary phases (free PbO and pyrochlore type) related to the PbO excess. The pyrochlore phase appeared in a layer near the top surface of the specimens. The thickness of the layer and the grain size of this secondary phase increased with the amount of PbO excess. A transmission electron microscopy (TEM) study of the sintered specimens revealed a core-shell structure in more than 30% of grains. The shell of these grains was Ti-rich PMN, and it is related to the presence of a liquid-phase-assisted sintering mechanism.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 3 , March 1999 , pp. 898 - 905
Copyright
Copyright © Materials Research Society 1999

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References

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