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<p>Zinc-doped holmium orthoferrite nanoparticles (Ho<sub>1–x</sub>Zn<sub>x</sub>FeO<sub>3</sub>, x = 0, 0.1, and 0.2) were synthesized using a simple co-precipitation method. Powder X-ray diffraction (PXRD) confirmed the formation of an orthorhombic perovskite phase, with average crystallite sizes of 38 ± 3–46 ± 5&#xa0;nm and unit cell volumes of 222.8–223.9 Å<sup>3</sup>, both increasing with Zn-doping concentration. Thermogravimetric analysis (TGA) indicated complete decomposition of hydroxides at approximately 850&#xa0;°C. Transmission electron microscopy (TEM) revealed particle sizes of 20–65&#xa0;nm, while energy-dispersive X-ray spectroscopy (EDX) confirmed the homogeneous distribution of the elements Ho, Zn, Fe, and O. Optical studies showed a reduction in bandgap energy (2.03–1.87&#xa0;eV) with Zn-doping, accompanied by enhanced net magnetization (2.76–3.31 emu·g⁻¹), as confirmed by vibrating-sample magnetometer (VSM). The anodes made from HoFeO<sub>3</sub>, Ho<sub>0.9</sub>Zn<sub>0.1</sub>FeO<sub>3</sub>, and Ho<sub>0.8</sub>Zn<sub>0.2</sub>FeO<sub>3</sub> were tested for Li-ion batteries at a current density of 0.1&#xa0;A·g<sup>–1</sup>. Over the first 50 cycles, their capacities gradually increased, reaching a maximum of 440.5 mAh·g<sup>–1</sup>. The electrodes HoFeO<sub>3</sub>, Ho<sub>0.9</sub>Zn<sub>0.1</sub>FeO<sub>3</sub>, and Ho<sub>0.8</sub>Zn<sub>0.2</sub>FeO<sub>3</sub> also demonstrate good reversibility, with Coulombic efficiency approaching 100% after the first cycle. These results highlight the potential applications of Zn-doped HoFeO<sub>3</sub> nanomaterials in optoelectronic and electrochemical fields.</p>

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Optical, magnetic and electrical properties of Zn-doped HoFeO3 nanoparticles synthesized by simple co-precipitation method

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • Vu Anh Thi Ngoc,
  • Thu Trang Nguyen Thi,
  • Chau Hong Diem,
  • Nguyen Tuan Loi,
  • Minh Ngoc Ha,
  • Cu Tran Duy Hau,
  • Nguyen Anh Tien

摘要

Zinc-doped holmium orthoferrite nanoparticles (Ho1–xZnxFeO3, x = 0, 0.1, and 0.2) were synthesized using a simple co-precipitation method. Powder X-ray diffraction (PXRD) confirmed the formation of an orthorhombic perovskite phase, with average crystallite sizes of 38 ± 3–46 ± 5 nm and unit cell volumes of 222.8–223.9 Å3, both increasing with Zn-doping concentration. Thermogravimetric analysis (TGA) indicated complete decomposition of hydroxides at approximately 850 °C. Transmission electron microscopy (TEM) revealed particle sizes of 20–65 nm, while energy-dispersive X-ray spectroscopy (EDX) confirmed the homogeneous distribution of the elements Ho, Zn, Fe, and O. Optical studies showed a reduction in bandgap energy (2.03–1.87 eV) with Zn-doping, accompanied by enhanced net magnetization (2.76–3.31 emu·g⁻¹), as confirmed by vibrating-sample magnetometer (VSM). The anodes made from HoFeO3, Ho0.9Zn0.1FeO3, and Ho0.8Zn0.2FeO3 were tested for Li-ion batteries at a current density of 0.1 A·g–1. Over the first 50 cycles, their capacities gradually increased, reaching a maximum of 440.5 mAh·g–1. The electrodes HoFeO3, Ho0.9Zn0.1FeO3, and Ho0.8Zn0.2FeO3 also demonstrate good reversibility, with Coulombic efficiency approaching 100% after the first cycle. These results highlight the potential applications of Zn-doped HoFeO3 nanomaterials in optoelectronic and electrochemical fields.