Electric Conductivity of Non-Stoichiometric Oxide MgCr2-xO4

Electric Conductivity of Non-Stoichiometric Oxide MgCr2-xO4

Single-phase cubic spinel structure MgCr2-xO4 compounds with a controlled Mg/Cr ratio were obtained in stoichiometric composition and Mg excessive region. All of those single phase samples were p-type semiconductor and their electrical resistivity decreased with increasing the Cr vacancy concentrati...

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Veröffentlicht in:Journal of the Ceramic Society of Japan 1999/03/01, Vol.107(1243), pp.258-262
Hauptverfasser: MORIWAKE, Hiroki, HATA, Takuoki, KATSUMATA, Masaaki, TAKAHASHI, Masayuki, SHIMONO, Isao
Format: Artikel
Sprache:eng ; jpn
Schlagworte:
Crystal structure
Magnesium chromate
Resistivity
Seebeck coefficient
XRD
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Zusammenfassung:Single-phase cubic spinel structure MgCr2-xO4 compounds with a controlled Mg/Cr ratio were obtained in stoichiometric composition and Mg excessive region. All of those single phase samples were p-type semiconductor and their electrical resistivity decreased with increasing the Cr vacancy concentration. This result supports our former conclusion that electrical conduction mechanism of this system is based on the p-type semiconductor conduction due to electrical hole by Cr4+.
ISSN:0914-5400
1882-1022
DOI:10.2109/jcersj.107.258