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Role of excess PbO on the microstructure and dielectric properties of lead magnesium niobate

Published online by Cambridge University Press:  03 March 2011

S.M. Gupta  and
A.R. Kulkarni
S.M. Gupta
Affiliation:
Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology, Bombay, 400 076 India
A.R. Kulkarni
Affiliation:
Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology, Bombay, 400 076 India
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Abstract

Stoichiometric and 2 wt. % excess lead oxide containing lead magnesium niobate (PMN) ceramics have been prepared by partial oxalate route. Dielectric measurements with frequency showed a typical relaxor behavior for stoichiometric PMN, while PMN with excess PbO shows a scatter in the dielectric curves at all temperatures above Tc. Under the same processing conditions, the dielectric constant (Kmax) decreases drastically from 16,300 to 9500 at 1 KHz for PMN without and with excess PbO, respectively. Microstructure studies revealed a second phase (unreacted PbO) segregated in the grain boundaries for excess PbO samples. A careful analysis of the data on dielectric properties and phases present coupled with microstructural detail indicate that the second phase in the grain boundary has a pronounced effect on the dielectric properties and not the pyrochlore phase.

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Articles
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Journal of Materials Research , Volume 10 , Issue 4 , April 1995 , pp. 953 - 961
Copyright
Copyright © Materials Research Society 1995

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