Electric Conduction of MgCr2O4 with Spinel Type Crystal Structure

The Stoichiometric compound MgCr2O4 was sintered at various holding times from 10min to 100h. All samples had a single-phase spinel structure and were p-type semiconductors. The lattice constants increased with increasing the holding time in sintering. The electrical resistivity and the Seebeck coef...

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Published inJournal of the Ceramic Society of Japan Vol. 107; no. 1246; p. 541
Main Authors MORIWAKE, Hiroki, HATA, Takuoki, KATSUMATA, Masaaki, TAKAHASHI, Masayuki, SHIMONO, Isao
Format Journal Article
LanguageEnglish
Published Tokyo Japan Science and Technology Agency 01.01.1999
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Summary:The Stoichiometric compound MgCr2O4 was sintered at various holding times from 10min to 100h. All samples had a single-phase spinel structure and were p-type semiconductors. The lattice constants increased with increasing the holding time in sintering. The electrical resistivity and the Seebeck coefficient decreased with increasing holding time. These phenomena indicate an increase in the electron carrier density. The activation energies of conduction and Seebeck coefficients differed by 0.3eV. This suggests that the conduction mechanism of this system is based not on band-type conduction, but on heat-activated p-type semiconductor conduction by electron holes introduced by Cr vacancies.
ISSN:1882-0743
1348-6535