Transformation studies of M- to W-type hexaferrite in BaFe12−2xCo3xO19

✍ Scribed by S. K. Mandal; K. Singh; D. Bahadur

• Book ID: 104738461
• Publisher: Springer
• Year: 1994
• Tongue: English
• Weight: 639 KB
• Volume: 29
• Category: Article
• ISSN: 0022-2461
• DOI: 10.1007/bf00357342

✦ Synopsis

Samples of general formula BaFel 2_2xCO3xO 1 9 ( x= 0.1,0.3, 0.5) have been synthesized by ceramic as well as citrate gel routes. The X-ray diffraction patterns indicate that M-type phase forms for x=0.1, while W-type phase is favourable for x=0.3 and 0.5. The results for x=0.3 are particularly interesting. While the X-ray diffraction data show evidence of a monophasic W-type hexaferrite, the magnetic, thermal and microstructural investigations indicate a secondary phase presumably at grain boundaries. Transformation of M-to W-type hexaferrite has been explained in terms of different possibilities such as nucleation of secondary phases, formation of vacancies and different site occupation of ions in the structure.