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

• Published in: Journal of magnetism and magnetic materials 1991-12, Vol.102 (3), p.305-313
• Main Authors: Muller, J., Collomb, A., Fournier, T., Harrowfield, I., Samaras, D.
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Inorganic compounds; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Water, oxides, hydroxides, peroxides
• ISSN: 0304-8853
• DOI: 10.1016/0304-8853(91)90143-X

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.