In this research, we investigate and discuss the characteristics of HoFeO3 nanoparticles synthesized by co-precipitation method at low temperature (t° ? 4 °C). The single-phase samples with orthorhombic structure formed after annealing precipitates different temperatures up to 950 °C. annealed have an average crystal size 10–20 nm (SEM, TEM). UV-Vis spectrum sample 750 °C showed strong UV Vis a...