Abstract
This study reports the first holmium orthoferrite nanocrystallite synthesized via the sol–gel method using egg white (EW), through the hydrolysis of Ho (III) and Fe (III) cations in boiling water (t° > 95 °C). The holmium orthoferrite was characterized by TG-DSC, PXRD, EDX, TEM, UV–Vis, and VSM techniques. Single-phase HoFeO3 was formed after calcination of the precursor at different temperatures up to 800 °C for 60 min. The PXRD and TEM results showed that the average crystallite sizes of all HoFeO3 samples were in the range of 20–30 nm. The obtained HoFeO3 nanopowders have strong absorption in the UV region (λ = 200÷400 nm) and visible region (λ = 400÷600 nm). Compared to previous studies, the holmium orthoferrite synthesized in this work exhibited larger magnetic parameters (Hc, Mr, and Ms), but a lower band gap energy value. These findings demonstrate their potential use not only as photocatalysts, but also as magnetic materials.
Highlights
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Orthoferrite HoFeO3 nanocrystals were synthesized using egg-white precursor.
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Average crystallite and particle sizes ~20–30 nm.
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Optical energy gap (Eg) ~1.96–2.02 eV.
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The magnetic characteristics (Mr and Ms) show increase with calcination temperature of the samples.
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Chung, N.T.K., Tien, N.A., Mittova, V.O. et al. Optical and magnetic properties of nano-crystalline orthoferrite holmium synthesized using egg-white precursor. J Sol-Gel Sci Technol 104, 239–245 (2022). https://doi.org/10.1007/s10971-022-05914-w
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DOI: https://doi.org/10.1007/s10971-022-05914-w