Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 21, Issue 13, Pages 2331-2344Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0955-2219(01)00214-X
Keywords
Bi4V2O11; electrical conductivity; grain boundaries; impedance spectroscopy; ionic conductivity
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Co- and Cu-substituted Bi4V2O11 compounds were synthesised by means of fine reactive powders with a typical d(50) close to 0.5 mum. Appropriate sintering conditions resulted in fine and homogeneous microstructure without any cracks related to large grain size. The total electrical conductivity was measured by complex impedance spectroscopy with respect to temperature, oxygen partial pressure, thermal history, and nature of dopant. The bulk and the grain boundary conductivity were also studied for both compounds. No time-dependence and no thermal hysteresis of the total electrical conductivity were observed and a structure dependence of the electrical properties was noticed. BICUVOX0.10 material can be considered as a pure oxide ion conductor within the investigated experimental conditions whereas BICOVOX0.10 exhibited a p-type conductivity contribution to the bulk conductivity with an ionic transference number greater than 0.97. (C) 2001 Elsevier Science Ltd. All rights reserved.
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