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Surface study of lead magnesium niobate ceramic using X-ray photoelectron spectroscopy

DSpace at IIT Bombay

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Title Surface study of lead magnesium niobate ceramic using X-ray photoelectron spectroscopy
 
Creator GUPTA, SM
KULKARNI, AR
VEDPATHAK, M
KULKARNI, SK
 
Subject powder
perovskites
permittivity
lead oxide
 
Description X-ray photoelectron spectroscopy (XPS) has been used to study the surface of ceramic lead magnesium niobate (PMN) when sintered at 1000 degrees C under two different conditions. Two oxidation states have been observed for Pb in PMN covered with MgO powder during sintering (PSM1000) whereas Pb exhibited a single oxidation state when fired without MO cover (2P1000). A shoulder peak Pb(4f(7/2)) at 136.7 eV binding energy has been assigned to PbO2 separate from the PbO peak at 138.0 eV in PSM1000 whereas the single Pb(4f(7/2)) peak st 138.1 eV has been assigned to PbO in 2P1000. The XPS depth profiles on PSM1000 confirm the existence of PbO2 in the bulk. The higher dielectric constant of the MgO-covered samples compared with uncovered is attributed to the difference in lead valencies.
 
Publisher ELSEVIER SCIENCE SA LAUSANNE
 
Date 2011-07-29T14:24:32Z
2011-12-26T12:48:45Z
2011-12-27T05:52:02Z
2011-07-29T14:24:32Z
2011-12-26T12:48:45Z
2011-12-27T05:52:02Z
1996
 
Type Article
 
Identifier MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 39(1), 34-40
0921-5107
http://dx.doi.org/10.1016/0921-5107(95)01524-8
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7739
http://hdl.handle.net/10054/7739
 
Language en