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AbstractAbstract
[en] The preliminary study of a Fesub(0.3)Znsub(0.7)SiF6.6H2O single crystal platelet, in which the twinned structure has been removed through the application of an external stress, enabled the study of FeSiF6-6H2O low-temperature form P21/c; in this case, the single-crystal absorber possesses three domain orientations, derived from each other by 120 deg rotations around the initial three-fold axis. All the single-crystal spectra, recorded at 4.2 K under magnetic fields applied along various directions, are interpreted with the following model: six iron sites, 3 domains x 2 sites, equivalent when there is no applied field. This model enabled us to measure accurately the asymmetry parameter, eta=0.32+-0.02, to determine the orientation of the OX and OY gradient axes with respect to the crystalline axes, and to measure the anisotropy of the hyperfine field created by the magnetization of Fe2+ in the easy plane
[fr]
Apres une etude prealable d'une lame monocristalline de Fesub(0,3)Znsub(0,7)SiF6.6H2O, obtenue non maclee a basse temperature par l'application d'une contrainte exterieure, on a pu etudier la forme basse temperature (P21/c) de FeSiF6.6H2O, le cristal comportant dans ce cas trois orientations de domaines decalees de 120 deg autour de l'axe ternaire initial. L'ensemble des spectres de monocristaux, a 4,2 K et sous champ magnetique dans diverses orientations, s'interprete bien en considerant six sites de fer (2 sites pour une orientation de domaine), equivalents en l'absence de champ magnetique. Nous avons determine avec precision le parametre d'asymetrie, eta=0,32+-0,02, oriente les axes du gradient par rapport aux axes cristallins (a 4 deg pres) et mesure l'anisotropie du champ hyperfin cree par aimantation dans le plan de facile aimantationOriginal Title
Etude Moessbauer de fluosilicates contenant Fe2+ et presentant une structure en domaines
Source
International conference on the applications of the Moessbauer effect; Bendor, France; 02 Sep 1974
Record Type
Journal Article
Literature Type
Conference
Journal
J. Phys. (Paris), Colloq; (no.6); p. 639-646
Country of publication
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