DSpace
 

DSpace at IIT Bombay >
IITB Publications >
Article >

Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/9898

Title: Grain and grain boundary relaxation in Sr1-xLaxTi1-xCrxO3 ceramics: impedance and modulus spectroscopy
Authors: DWIVEDI, RK
KUMAR, D
PARKASH, O
Keywords: dielectric-relaxation
conductivity
behavior
Issue Date: 2003
Publisher: MANEY PUBLISHING
Citation: BRITISH CERAMIC TRANSACTIONS, 102(1), 1-9
Abstract: 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.
URI: http://dx.doi.org/10.1179/096797803225009201
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9898
http://hdl.handle.net/10054/9898
ISSN: 0967-9782
Appears in Collections:Article

Files in This Item:

There are no files associated with this item.

View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback