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Grain and grain boundary relaxation in Sr1-xLaxTi1-xCrxO3 ceramics: impedance and modulus spectroscopy

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Title Grain and grain boundary relaxation in Sr1-xLaxTi1-xCrxO3 ceramics: impedance and modulus spectroscopy
 
Creator DWIVEDI, RK
KUMAR, D
PARKASH, O
 
Subject dielectric-relaxation
conductivity
behavior
 
Description Tile structure and dielectric behaviour of the valence compensated system Sr1-xLaxTl1-xCrxO3 (x less than or equal to 0.50) have been studied. Complex Plane and spectroscopic studies of the impedance and modulus functions have been made in the temperature range 100-550 K to separate out the various contributions to the overall polarisation electrical behaviour. The immittance data of various compositions in the system call be modelled by an equivalent circuit containing three parallel RC elements connected in series. These three elements correspond to the grain (bulk), grain boundaries, and electrode/specimen interface. It has been observed that the resistance of grain boundaries in all samples except x = 0.05 is higher than that of the grains. At low temperatures the contribution electrode polarisation to total observed resistance is small in comparison with that of the grains and grain boundaries, and becomes significant only at high temperatures, Debye type relaxation owing to reorientation of dipoles is observed within the grains at low With increasing temperature, Maxwell-Wagner type polarisation is observed at grain, grain boundary interfaces. The relaxation observed at high temperatures and low frequencies corresponds to electrode specimen interface polarisation.
 
Publisher MANEY PUBLISHING
 
Date 2011-08-18T04:59:34Z
2011-12-26T12:55:35Z
2011-12-27T05:41:20Z
2011-08-18T04:59:34Z
2011-12-26T12:55:35Z
2011-12-27T05:41:20Z
2003
 
Type Article
 
Identifier BRITISH CERAMIC TRANSACTIONS, 102(1), 1-9
0967-9782
http://dx.doi.org/10.1179/096797803225009201
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9898
http://hdl.handle.net/10054/9898
 
Language en