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Synthesis of cobalt-doped bismuth vanadate by combustion-synthesis: Influence of fuel on phase content and morphology

Published online by Cambridge University Press:  31 January 2011

Banasri Roy  and
Paul A. Fuierer
Banasri Roy*
Affiliation:
Department of Materials and Metallurgical Engineering, New Mexico Institute of Technology, Socorro, New Mexico 87801
Paul A. Fuierer
Affiliation:
Department of Materials and Metallurgical Engineering, New Mexico Institute of Technology, Socorro, New Mexico 87801
*
a) Address all correspondence to this author.e-mail: [email protected]
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Abstract

Cobalt (15 at.%) doped bismuth vanadate, Bi4(V0.85Co0.15)2O11-δ (BICOVOX0.15), is known to have high oxygen ion conduction in the medium temperature range (400–600 °C). Small grain size may be important in stabilizing the highly conductive and disordered γ-phase at lower temperature. In this article, we report for the first time the synthesis of highly porous nanoscale BICOVOX powders by a solution combustion technique. The effects of fuel-to-oxidizer ratio, and postcombustion heat treatment temperature and time on the phase content and microstructure of the powders were investigated. As-combusted powders were revealed to be a mixture of Bi2O3, BiVO4, and γ-BICOVOX phases that were converted to phase pure γ-BICOVOX during heat treatment.

Keywords

Combustion synthesisIonic conductorMorphology
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 10 , October 2009 , pp. 3078 - 3086
Copyright
Copyright © Materials Research Society 2009

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