Abstract
Thermally stable perovskite-like SmFeO3 powders were obtained by the co-precipitation method using (NH4)2CO3 as a precipitating agent; their physicochemical, optical, and magnetic properties were characterized to preliminary evaluate their potential applications. It was found that a well-crystallized pure-phase SmFeO3 will be obtained when the calcination temperature ( tc) reaches 850°C. The average size of SmFeO3 crystallites was about 45, 55, and 64 nm for the SmFeO3-750, -850, and -950 samples, respectively. The orthorhombic structure was distorted, as evidenced by the varied unit cell volume (from 233.35·10−3 to 233.07·10−3 nm3) and microstrain (from 2.02·10−3 to 0.009·10−3) in dependence on tc (from 750 to 950°C), respectively. The synthesized SmFeO3 samples exhibited paramagnetic properties, with the coercive field ( Hc) in the range of 250–750 Oe. Moreover, the obtained materials have direct bandgap energies with values below 3.06 eV.
Published Version
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