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Composition and structure of some [Ba1− p Sr p ]ZnFe6O11 Y-type hexagonal ferrites

Identifieur interne : 00EE83 ( Main/Merge ); précédent : 00EE82; suivant : 00EE84

Composition and structure of some [Ba1− p Sr p ]ZnFe6O11 Y-type hexagonal ferrites

Auteurs : J. Muller [France] ; A. Collomb [France] ; T. Fournier [France] ; I. Harrowfield [Australie] ; D. Samaras [Grèce]

Source :

Journal of Magnetism and Magnetic Materials [ 0304-8853 ] ; 1991.

RBID : ISTEX:E7BDE84344F2543A0F439C260C79DFF7B4ED7212

English descriptors

Abstract

Abstract: Single crystals of the [Ba1−pSrp]ZnFe6O11 series (p varying from 0 to 0.7) were synthesized and studied by means of scanning electron microscope and X-ray diffraction. As soon as Sr is present in the structure, the single crystals are poly-phased, and the chemical formulae show a difference with the starting chemical composition. Only the T-block is affected by the presence of the Sr cation: i) the Zn population on the Me1 tetrahedron of the T-block decreases without increasing on the Me2 tetrahedron of the S-block; ii) we are in presence of a displacement of some cations inducing very small changes in the cation-oxygen distances and cation-oxygen-cation angles of the superexchange interaction paths. Therefore, the helimagnetism noted in the [Ba1−pSrp]ZnFe6O11 compounds could be due to the poly-phased crystals, each showing different magnetic behavior.

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https://api.istex.fr/document/E7BDE84344F2543A0F439C260C79DFF7B4ED7212/fulltext/pdf

DOI: 10.1016/0304-8853(91)90143-X

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<term>Chemical composition</term>
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<term>Tetrahedron</term>
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<term>Neutral atoms</term>
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<term>Oxygen polyhedra</term>
<term>Plane distance</term>
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<term>Population parameters</term>
<term>Progressive presence</term>
<term>Scanning electron microscope</term>
<term>Single crystal diffraction</term>
<term>Single crystal neutron diffraction</term>
<term>Single crystals</term>
<term>Sizov</term>
<term>Small changes</term>
<term>Small differences</term>
<term>Standard deviation</term>
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<front><div type="abstract" xml:lang="en">Abstract: Single crystals of the [Ba1−pSrp]ZnFe6O11 series (p varying from 0 to 0.7) were synthesized and studied by means of scanning electron microscope and X-ray diffraction. As soon as Sr is present in the structure, the single crystals are poly-phased, and the chemical formulae show a difference with the starting chemical composition. Only the T-block is affected by the presence of the Sr cation: i) the Zn population on the Me1 tetrahedron of the T-block decreases without increasing on the Me2 tetrahedron of the S-block; ii) we are in presence of a displacement of some cations inducing very small changes in the cation-oxygen distances and cation-oxygen-cation angles of the superexchange interaction paths. Therefore, the helimagnetism noted in the [Ba1−pSrp]ZnFe6O11 compounds could be due to the poly-phased crystals, each showing different magnetic behavior.</div>
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Composition and structure of some [Ba1− p Sr p ]ZnFe6O11 Y-type hexagonal ferrites

Composition and structure of some [Ba1− p Sr p ]ZnFe6O11 Y-type hexagonal ferrites

Source :

English descriptors

Abstract

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