Composition and structure of some [Ba1− p Sr p ]ZnFe6O11 Y-type hexagonal ferrites
Identifieur interne : 002B62 ( Istex/Curation ); précédent : 002B61; suivant : 002B63Composition 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.
English descriptors
- KwdEn :
- Acta cryst, Anisotropic, Basal plane, Black spots, Blocks boundary, Bond strength, Cation, Chemical composition, Chemical formula, Different samples, Final positions, First notice, Hexagonal, Hexagonal cell parameters, Hexagonal ferrites, Hexagonal ferrites table, Interatomic distances, Interplanar distances, Magnetic structure, Main phase, Neutral atoms, Octahedron, Oxygen layers, Oxygen planes, Oxygen polyhedra, Plane distance, Polyhedron, Population parameters, Progressive presence, Scanning electron microscope, Single crystal diffraction, Single crystal neutron diffraction, Single crystals, Sizov, Small changes, Small differences, Standard deviation, Standard deviations, Superexchange interaction paths, Tetrahedral sites, Tetrahedron.
- Teeft :
- Acta cryst, Anisotropic, Basal plane, Black spots, Blocks boundary, Bond strength, Cation, Chemical composition, Chemical formula, Different samples, Final positions, First notice, Hexagonal, Hexagonal cell parameters, Hexagonal ferrites, Hexagonal ferrites table, Interatomic distances, Interplanar distances, Magnetic structure, Main phase, Neutral atoms, Octahedron, Oxygen layers, Oxygen planes, Oxygen polyhedra, Plane distance, Polyhedron, Population parameters, Progressive presence, Scanning electron microscope, Single crystal diffraction, Single crystal neutron diffraction, Single crystals, Sizov, Small changes, Small differences, Standard deviation, Standard deviations, Superexchange interaction paths, Tetrahedral sites, Tetrahedron.
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.
Url:
DOI: 10.1016/0304-8853(91)90143-X
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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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