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Crystal structure and microstructure of Z-type hexaferrite (Ba, La)Co2Fe24O41 by molten salt synthesis

Authors
Lee, Do HyeokKwon, Chae-YeonMoon, Kyoung-Seok
Issue Date
2021
Publisher
KOREAN ASSOC CRYSTAL GROWTH, INC
Keywords
Hexaferrite; Molten salt; Crystal structure; Microstructure
Citation
JOURNAL OF THE KOREAN CRYSTAL GROWTH AND CRYSTAL TECHNOLOGY, v.31, no.5, pp.197 - 202
Indexed
KCI
Journal Title
JOURNAL OF THE KOREAN CRYSTAL GROWTH AND CRYSTAL TECHNOLOGY
Volume
31
Number
5
Start Page
197
End Page
202
URI
https://scholarworks.bwise.kr/gnu/handle/sw.gnu/5694
DOI
10.6111/JKCGCT.2021.31.5.197
ISSN
1225-1429
Abstract
Synthesis of Z-type hexaferrite Ba3Co2Fe24O41 (Ba(3)Z) and Ba1.5La1.5Co2Fe24O41 (Ba(1.5)La(1.5)Z) powders were tried using molten salt synthesis after primary calcination. Ba(3)Z calcined at 1000 degrees C was formed with both M-type and Y-type hexaferrite, and then Z-type was obtained when sintered with molten salt at 1150 degrees C and 1200 degrees C. In the case of Ba(1.5)La(1.5)Z calcined at 1000 degrees C, however, M-type hexaferrite, CoFe2O4 (Spinel phase), and LaFeO3 were synthesized. As a result, Z-type hexaferrite was not synthesized after sintering with molten salt. In addition, the aspect ratio of the particles decreased as the sintering temperature increased with molten salt synthesis. To obtain a single-phase Ba(1.5)La(1.5)Z with a high aspect ratio, it is expected the raw materials have to calcine below the temperature of a spinel phase formation before sintering with molten salt.
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