EVIDENCE OF A HOPPING MECHANISM BETWEEN MO(3+) AND MO(4+) OCTAHEDRAL CATIONS IN MOLYBDENUM SPINEL FERRITES

Authors
DOMENICHINI B AYMES D PERRIAT P GILLOT B
Citation
B. Domenichini et al., EVIDENCE OF A HOPPING MECHANISM BETWEEN MO(3+) AND MO(4+) OCTAHEDRAL CATIONS IN MOLYBDENUM SPINEL FERRITES, Materials chemistry and physics, 39(1), 1994, pp. 80-84
Citations number
14
Categorie Soggetti
Material Science
Journal title
Materials chemistry and physics → ACNP
ISSN journal
02540584
Volume
39
Issue
1
Year of publication
1994
Pages
80 - 84
Database
ISI
SICI code
0254-0584(1994)39:1<80:EOAHMB>2.0.ZU;2-1
Abstract
The electrical conductivity of two kinds of molybdenum ferrites has be en studied during their oxidation in cation-deficient spinel under O2 atmosphere, using a linear heating rate. The conductivity evolution du ring the oxidation reaction was related to the change in the cationic distribution; for instance, the two registered decreases in the conduc tivity correspond to the disappearance of the Fe2+/Fe3+ and the Mo3+/M o4+ ion pairs on octahedral sites. Such an observation could be explai ned by the existence of two hopping mechanisms on the octahedral sites between the Fe2+ and Fe3+ ions on the one hand and the Mo3+ and Mo4ions on the other hand.