| Summary: | In this research, we investigate and discuss the characteristics of HoFeO<sub>3</sub> nanoparticles synthesized by the co-precipitation method at low temperature (t° ≤ 4 °C). The single-phase HoFeO<sub>3</sub> samples with the orthorhombic structure formed after annealing of the precipitates at different temperatures up to 950 °C. The annealed HoFeO<sub>3</sub> nanoparticles have an average crystal size of 10–20 nm (SEM, TEM). UV-Vis spectrum of HoFeO<sub>3</sub> sample annealed at 750 °C showed strong UV and Vis absorption with small optical energy gap (E<sub>g</sub> = 1.56 eV). In the range temperature of 100–300 K, the HoFeO<sub>3</sub> samples showed superparamagnetic behaviour at 5 kOe with high magnetization (M<sub>s</sub> = 1.3–2.4 emu/g) and very low susceptibility (χ << 1).
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