Journal
MATERIALS TECHNOLOGY
Volume 36, Issue 1, Pages 36-45Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10667857.2020.1723832
Keywords
Strontium hexaferrite; molten-salt synthesis; rare-earth substitution; magnetic properties
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Funding
- (Meity) Ministry of Electronics & Information Technology
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Rare earth substituted strontium hexaferrite powders were synthesized through a molten salt route, showing improved magnetic properties in the substituted samples, with the samarium-doped sample exhibiting the highest magnetic measurements at room temperature. The temperature-dependent magnetic properties of strontium ferrites also showed potential for applications in magnetic field sensors as saturation magnetization and remanence increased with decreasing temperature.
Rare earth substituted strontium hexaferrite powders were synthesised through a molten salt route at 900 degrees C for 5 h. The influence of rare-earth magnetic ion substitution on microstructural features, morphology and temperature-dependent magnetic properties was investigated. The lattice parameter ratio of less than 3.98 proves that all the substituted samples primarily present the hexaferrite phase. Fourier transform infrared peaks also confirmed the presence of a metal-oxygen bond. A 66% increase in magnetic saturation, 38% increase in coercivity and a more than two-time increase in remanence for the samarium doped sample are seen as the highest magnetic measurements compared to pure SrFe12O19 at room temperature. There were also differences in the temperature-dependent magnetic properties of strontium ferrites. As temperature decreased from 300 K, saturation magnetisation and remanence value were found to increase. This will perhaps be a promising material for magnetic field sensor application.
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