Structural, optical and magnetic properties of the nanosized perovskite-like DyFeO3 prepared by modified co-precipitation method

Chúng tôi vui mừng thông báo rằng TS. Vũ Thị Ngọc Ánh và các đồng nghiệp gần đây đã xuất bản công trình của họ có tựa đề "Structural, optical and magnetic properties of the nanosized perovskite-like DyFeO3 prepared by modified co-precipitation method" trên tạp chí Journal of Materials Science: Materials in Electronics.

Tóm tắt:

In this work, DyFeO₃ nanoparticles were synthesized by an improved co-precipitation method via the hydrolysis of Dy³⁺ and Fe³⁺ cations in boiling water, using a 5% ammonia solution as the precipitation agent. The physicochemical characteristics of the samples calcined at 750, 850, and 950 °C for 60 min were evaluated using FTIR, Raman, PXRD, EDX, SEM, TEM, DRS, and VSM methods. The stable single-phase DyFeO₃ perovskite nanocrystals were obtained after calcination of the dried precursor at 750, 850, and 950 °C. According to PXRD, the average size of DyFeO₃ crystals was calculated to be approximately 36–50 nm. The results revealed a homogeneous distribution of the main elements on the samples’ surfaces, with morphology consisting of isometric and highly agglomerated nanoparticles; the size of most DyFeO₃ nanoparticles calcined at 850 °C distributed in the range of 30–50 nm. In the applied field from − 15 to + 15 kOe, the sample calcined at 850 and 950 °C had low values of coercive field (H_c = 1.4 × 10⁻²–1.8 × 10⁻² Oe) and remanent magnetization (M_r = 1.10 × 10⁻⁷–0.54 × 10⁻⁷ emu g⁻¹, but high values of net magnetization (M_n = 2.69–2.75 emu g⁻¹); the samples appeared to behave as paramagnetic materials. The DyFeO₃-850 °C and DyFeO₃-950 °C samples demonstrated a high absorbance at wavelengths of 400–600 nm, with low values of direct bandgap (E_g = 2.31–2.15 eV).