Effects of Different Salts on Salt-Assisted Ultrasonic Spray Pyrolysis (SA-USP) Calcination for the Synthesis of Strontium Ferrite
- Authors
- Hwang, Tea-Yeon; An, Guk-Hwan; Cho, Jeong-Ho; Kim, Jongryoul; Choa, Yong-Ho
- Issue Date
- Oct-2015
- Publisher
- American Scientific Publishers
- Keywords
- Hexaferrite; High Coercivity; Magnetization; Solution Process; Salt Assisted; Spray Pyrolysis; Particle Size Control; Single-Domain Particle Size
- Citation
- Journal of Nanoscience and Nanotechnology, v.15, no.10, pp.8062 - 8069
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of Nanoscience and Nanotechnology
- Volume
- 15
- Number
- 10
- Start Page
- 8062
- End Page
- 8069
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/181902
- DOI
- 10.1166/jnn.2015.11259
- ISSN
- 1533-4880
- Abstract
- Strontium ferrite (hexaferrite), SrFe12O19, was successfully fabricated in sizes ranging from hundreds of nanometers to several micrometers by salt-assisted ultrasonic spray pyrolysis-calcination using different salt media. All samples were single phases of SrFe12O19 without the intermediate phase, alpha-Fe2O3, and their morphology was hexagonal. As calcination temperature increased, the size of as-calcined samples and saturation magnetization, M-s, increased while coercivity decreased. The particle size of the obtained nanoparticles varied depending on the salt media and calcination temperatures. The best magnetic properties obtained in this experiment were a coercivity of 6973 Oe with a saturation magnetization of 68.3 emu/g. To the best of our knowledge, these coercivity values are the highest ever obtained. We propose a detailed mechanism explaining the growth of these particles and conclude that the resulting single-domain particle size is about 70 nm, taking into account of factors affecting coercivity in ferrite nano- to micro-sized particles.
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