期刊
JOURNAL OF ELECTRONIC MATERIALS
卷 43, 期 9, 页码 3574-3581出版社
SPRINGER
DOI: 10.1007/s11664-014-3228-9
关键词
Hexaferrite; salt assisted; spray pyrolysis; particle size control; high coercivity; magnetic alignment
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2008-0061891]
- National Research Foundation of Korea - Ministry of Science, ICT, and Future Planning [NRF-2012-0001262]
Strontium hexaferrite (SrFe12O19, SrM) suitable for high-performance permanent magnet applications was synthesized by salt-assisted ultrasonic spray pyrolysis (SA-USP) and subsequent calcination. To control the particle size, the intermediate phase of SrM was collected by SA-USP and various sizes of SrM were obtained by calcining the as-prepared sample at temperatures ranging from 800A degrees C to 1050A degrees C. The synthesized SrM was magnetically aligned by using an external magnetic field to improve remanence. The synthesized particles were of nano- to submicron scale and nonagglomerated. The magnetic properties and squareness of the material depended on the particle size and distribution. Additionally, the NaCl added during synthesis facilitated the formation of nonagglomerated particles, while enhancing and controlling particle growth. The optimum magnetic properties were achieved at calcination temperature of 1000A degrees C, resulting in coercivity of 5646 Oe, saturation magnetization of 73.3 emu/g, and remanence of 59.1 emu/g (80.6% of M (s)).
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