Journal of the Ceramic Society of Japan, Supplement
Online ISSN : 1349-2756
ISSN-L : 1349-2756
Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue
Session ID : 9
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Mixed Transition Ion Effect in Certain Polaronic Semiconductors
Biprodas DUTTAIan L. PEGG
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Keywords: Small polaron, Glass
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Abstract
The presence of vanadium and iron in phosphate glasses has been found to exhibit properties similar to the mixed alkali effect observed in oxide glasses. While conduction in the latter is caused by a classical barrier crossing mechanism of alkali ions, a quantum-mechanical process, comprising hopping of small polarons, is generally accepted to be the mechanism of charge transport in phosphate glasses containing transition metals. The substitution of one transition ion by another significantly increases dc resistivity activation energy for dc conduction and glass transition temperature, reaching maxima at an intermediate transition ion ratio.
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© 2004 The Ceramic Society of Japan
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