Journal of Materials Research

Materials Communications

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

Ming Li c1, Antonio Feteira, Mehdi Mirsaneha1, Michael T. Lanagana2 and Derek C. Sinclaira3 c2

a1 Ceramics and Composites Laboratory, Department of Engineering Materials, The University of Sheffield, Sheffield, S1 3JD United Kingdom

a2 Center for Dielectric Studies, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802

a3 Ceramics and Composites Laboratory, Department of Engineering Materials, The University of Sheffield, Sheffield, S1 3JD United Kingdom

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.

(Received November 19 2009)

(Accepted March 08 2010)

Key Words:

  • Ceramic;
  • Dielectric;
  • Electrical Properties

Correspondence:

c1 Address all correspondence to this author. e‐mail: m.li@sheffield.ac.uk

c2 Address all correspondence to this author. e‐mail: D.C.Sinclair@sheffield.ac.uk

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