Magnetic properties and Mössbauer study of gallium doped M-type barium hexaferrites. Issue 15 (15th October 2017)

• Record Type: Journal Article
• Authors: Trukhanov, A.V.; Kostishyn, V.G.; Panina, L.V.; Jabarov, S.H.; Korovushkin, V.V.; Trukhanov, S.V.; Trukhanova, E.L.
• Is Part Of: Ceramics international. Volume 43:Issue 15(2017)
• Page Start: 12822
• Page End: 12827
• Publication Date: 2017-10-15
• Subjects: Ceramics -- M-type hexaferrites -- Diamagnetic substitution -- Mossbauer study -- Cation distribution -- Magnetic properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.06.172
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Ga-substituted (0 < x < 1.2) ceramics samples of the M-type Ba-hexaferrites (BaFe12 O19 ) were obtained via solid state reactions. The features of crystal structure were studied by XRD. It has been observed that with x increase the unit cell parameters linearly and slightly decrease. The very small reduction of the unit cell parameters and, of the resulting unit cell volume is caused by the very small difference of ionic radiuses of Ga 3+ (0.62 Å) and Fe 3+ (0.64 Å) cations. Raman spectroscopy investigations and Mossbauer studies were performed. The distribution of Ga 3+ in different non-equivalent oxygen coordination (octahedral, tetrahedral and bipiramidal position) is not statistical. It has been established that in BaFe12−x Gax O19 (0 < x < 1.2) solid solutions magnetic properties critically depend on the Ga 3+ cations distribution by different oxygen coordination. At a low level of diamagnetic substitution (x < 0.3) Ga 3+ cations are preferably distributed in 2 b position. At a higher level of diamagnetic substitution (x < 0.9) Ga 3+ cations are preferably distributed in 12 k position. Experimental data of Mossbauer studies are in good agreement with theoretical data which were obtained using the first principles total energy calculations (based on density functional theory).