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Dielectric and microstructure studies of lead magnesium niobate prepared by partial oxalate route

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Title Dielectric and microstructure studies of lead magnesium niobate prepared by partial oxalate route
 
Creator GUPTA, SM
KULKARNI, AR
 
Subject glassy behavior
pb(mg1/3nb2/3)o3
powder
ceramics
 
Description Lead magnesium niobate (PMN) has been prepared using the partial oxalate method without addition of excess PbO and sintering at four different temperatures, 900, 1000, 1100 and 1200 degrees C. Increase in the sintering temperature resulted in increased dielectric constant which is attributed to an increase in the grain size. Here we report an usually high dielectric constant (24000 at -16 degrees C, 1 kHz) observed in PMN sintered at 1200 degrees C [PMN (1200)]. The room temperature dielectric constant and dissipation factor at 1 kHz is similar to 15000 and 0.0025, respectively, for PMN (1200). These values are superior to the reported values. A detailed and systematic study on phase, physical and dielectric properties and microstructure has been carried out. Grain size appears to be a dominant factor in controlling dielectric constant rather than the pyrochlore phase, as claimed earlier.
 
Publisher ELSEVIER SCI LTD
 
Date 2011-07-22T00:21:33Z
2011-12-26T12:52:13Z
2011-12-27T05:39:18Z
2011-07-22T00:21:33Z
2011-12-26T12:52:13Z
2011-12-27T05:39:18Z
1996
 
Type Article
 
Identifier JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 16(4), 473-480
0955-2219
http://dx.doi.org/10.1016/0955-2219(95)00117-4
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6045
http://hdl.handle.net/10054/6045
 
Language en