Raman Spectra and Vibrational Analysis of BaFe12O19Hexagonal Ferrite

✍ Scribed by J. Kreisel; G. Lucazeau; H. Vincent

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 453 KB
• Volume: 137
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1997.7737

✦ Synopsis

This paper reports on the first Raman spectra of barium hexaferrite, BaFe 12 O 19 , as a member of the magnetoplumbite-type structure. The spectra, recorded from 150 to 1000 cm ؊1 at room and liquid nitrogen temperature, are analyzed on the basis of D 6h factor group selection rules. The iron atom on the bipyramidal site is discussed with regard to its particular dynamics. The distribution of normal modes in BaFe 12 O 19 is examined on the basis of the Raman spectra of -alumina and a series of ferrites. Emphasis has been put on the factors influencing the Raman frequencies, namely the value of the coordination number, the degree of connection of a coordinated group, and the mass effect.