MÖSSBAUER EFFECT IN THE SPINEL Co2.94 Fe0.06S4 BETWEEN 10 K AND ROOM TEMPERATURE

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Submitted on 1 Jan 1976

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MÖSSBAUER EFFECT IN THE SPINEL Co2.94

Fe0.06S4 BETWEEN 10 K AND ROOM

TEMPERATURE

F. Woodhams, O. Knop

To cite this version:

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JOURNAL DE PHYSIQUE Colloque C6, supplkment au no 12, Tome 37, Dicembre 1976, page C6-577

MOSSBAUER EFFECT IN THE SPINEL

CO,,, Feom0,S,

BETWEEN 10 K AND

ROOM

TEMPERATURE

(*)

F.

W. D. WOODHAMS

Department of Natural Philosophy, University of Aberdeen, Aberdeen, Scotland and

0. KNOP

Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada

R6sum6.

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Les spectres Mossbauer du 57Fe dans la spinelle C02.94Fe0.06S4 tkmoignent de l'existence d'une transition magngtique B Ttr 95 K dans la phase mkre Co3S4. Au-dessous de

Tt, on observe un spectre magnetique B six composantes superpost5 B un doublet quadrupolaire,

tandis qu'au-dessus de Ttr les six composantes du spectre magnktique fusionnent, ce qui produit une bande unique superposke au spectre quadrupolaire. Les valeurs des paramktres Mossbauet et le rapport de l'aire du spectre magnktique a celle du spectre quadrupolaire suggerent une rkpartitlon des atomes du Co et du Fe sur le rkseau spinelle suivant

les atomes Fe prkfkrant des sites

a

coordinence tktrakdrique.

Abstract.

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Mossbauer spectra of 57Fe probe atoms in the spinel C02.94Fe0.06S4 indicate the existence of a magnetic transition at Ttr

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95 K in the parent phase Co3S4. The spectrum observed below Ttr consists of a six-line magnetic spectrum and a two-line quadrupole spectrum. Above

Ttr the six-line spectrum collapses to a single line superposed on the two-line quadrupole spectrum. Consideration of the Mossbauer parameters and of the area ratio of the component spectra suggests that the atomic occupancy of the spinel lattice is

[Coo.9aeFe3+(HS)o.osz] [C0o.~86Fe2+(~S)o.ol~]2~~, the Fe atoms having preference for the tetrahedrally coordinated cation sites.

(*) Can. J. Chem. (to be published).