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A link between p-type electrical conduction and microwave dielectric loss in highly ordered Ba(Co1/3Nb2/3)O3 ceramics

Published online by Cambridge University Press:  31 January 2011

Ming Li ,
Antonio Feteira ,
Mehdi Mirsaneh ,
Michael T. Lanagan  and
Derek C. Sinclair
Mehdi Mirsaneh
Affiliation:
Ceramics and Composites Laboratory, Department of Engineering Materials, The University of Sheffield, Sheffield, S1 3JD United Kingdom
Michael T. Lanagan
Affiliation:
Center for Dielectric Studies, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
Derek C. Sinclair*
Affiliation:
Ceramics and Composites Laboratory, Department of Engineering Materials, The University of Sheffield, Sheffield, S1 3JD United Kingdom
*
b)Address all correspondence to this author. e‐mail: D.C.Sinclair@sheffield.ac.uk
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Abstract

BaCo1/3Nb2/3O3 ceramics, with a high density and a similar, high degree of 1:2 B-site cation ordering, exhibit very different quality factors, Q. The ceramics exhibit p-type behavior with higher conductivity and lower Q for samples processed in O2 as compared with those processed in air. It is proposed that unavoidable Co loss during high-temperature ceramic processing leads to p-type doping that must be compensated by oxygen vacancies to impede hole formation. The composition exhibiting only intrinsic conduction and optimized Q is not achieved with processing in atmospheric oxygen due to filling of oxygen vacancies and hole formation during cooling.

Keywords

CeramicDielectricElectrical Properties
Type
Materials Communications
Information
Journal of Materials Research , Volume 25 , Issue 6 , June 2010 , pp. 1011 - 1014
Copyright
Copyright © Materials Research Society 2010

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