Record Details


Field	Value

Title	ROLE OF EXCESS PBO ON THE MICROSTRUCTURE AND DIELECTRIC-PROPERTIES OF LEAD MAGNESIUM NIOBATE

Creator	GUPTA, SM KULKARNI, AR

Subject	pb(mg1/3nb2/3)o3 powder ceramics

Description	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 relaxer behavior for stoichiometric PMN, while PMN with excess PbO shows a scatter in the dielectric curves at all temperatures above T-c. Under the same processing conditions, the dielectric constant (K-max) 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.

Publisher	MATERIALS RESEARCH SOCIETY

Date	2011-08-18T16:06:57Z 2011-12-26T12:55:49Z 2011-12-27T05:42:45Z 2011-08-18T16:06:57Z 2011-12-26T12:55:49Z 2011-12-27T05:42:45Z 1995

Type	Article

Identifier	JOURNAL OF MATERIALS RESEARCH, 10(4), 953-961 0884-2914 http://dx.doi.org/10.1557/JMR.1995.0953 http://dspace.library.iitb.ac.in/xmlui/handle/10054/10064 http://hdl.handle.net/10054/10064

Language	en

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