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Home > Issues > SearchSynthesis and Magnetic Properties of Na-La-Co System M-type Ferrite
Journal of Magnetics, Volume 26, Number 3, 30 Sep 2021, Pages 305-310
Sung-Woo Shon (Pukyong University), Bu-An Kim * 
(Pukyong University), Hae-Woong Kwon (Pukyong University), Jung-Goo Lee * (jglee36@kims.re.kr)
(Pukyong University), Hae-Woong Kwon (Pukyong University), Jung-Goo Lee * (jglee36@kims.re.kr)
Abstract
In this study, we investigated the synthesis of Na-La system M-type ferrite with different mole ratios. Some part
of Fe in the M-type ferrite was substituted by Co, and variation of fraction of the M-type ferrite as function of
mole ratio was investigated. Sample with/without Co-substitution composed of multiphases of M-type ferrite
and other phases. Fraction of M-type ferrite in the samples was depending on mole ratio in the raw material.
Curie temperatures of Co-free and Co-substituted M-type ferrite were approximately 432℃ and 428 ℃,
respectively. Saturation magnetisation of the Co-free Na0.5La0.5 system M-type ferrite was approximately 72.5
emu/g.
of Fe in the M-type ferrite was substituted by Co, and variation of fraction of the M-type ferrite as function of
mole ratio was investigated. Sample with/without Co-substitution composed of multiphases of M-type ferrite
and other phases. Fraction of M-type ferrite in the samples was depending on mole ratio in the raw material.
Curie temperatures of Co-free and Co-substituted M-type ferrite were approximately 432℃ and 428 ℃,
respectively. Saturation magnetisation of the Co-free Na0.5La0.5 system M-type ferrite was approximately 72.5
emu/g.
Keywords: hard ferrite; ferrite permanent magnet; alkali-metal-based M-type ferrite; Co-substituted M-type ferrite
DOI: https://doi.org/10.4283/JMAG.2021.26.3.305
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