THERMAL AND MAGNETIC PROPERTIES OF HoFeO3 NANOPARTICLES PREPARED BY CHEMICAL CO-PRECIPITATION METHOD
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Abstract
In this paper, HoFeO3 orthoferrite nanoparticles with perovskite-type were successfully synthesized through a simple chemical co-precipitation method by using sodium solution 5% as a precipitating agent. After annealing the precursor at 700, 800, and 900°C for 60 minutes, a single phase HoFeO3 orthoferrite product was formed with an average crystallite size of 35-70 nm and the particle size of 30-50 nm. The average crystal size and lattice volume of nanocrystalline HoFeO3 increased in line with the annealing temperature. The HoFeO3 samples showed antiferromagnetic properties with super-paramagnetic behaviour. The obtained properties are expressed as low values of coercive force (Hc < 10 Oe) and remanent magnetization (Mr ~ 0 emu·g-1), high magnetization (Ms ~ 5 emu·g-1)). The magnetic parameters of the HoFeO3 nanomaterials such as the coercive force and remanent magnetization are lower, but the saturation magnetization is higher compared to the published rare-earth perovskite orthoferrite nanomaterials LaFeO3, NdFeO3, PrFeO3.
Keywords
chemical co-precipitation method, HoFeO3, nanomaterials, thermal and magnetic properties
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References
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