Effect of substitution on the structural and magnetic properties of Sm3+-doped / SmFeO3 in nickel-copper-zinc mixed ferrite nanoparticles
| Autor: | Chenglong Lei, Yun He, Jinpei Lin, Liping Wang, Qing Lin, Jianghui Dong |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Ionic radius Materials science Scanning electron microscope Magnetism Process Chemistry and Technology Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Magnetic hysteresis 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Lattice constant Superexchange 0103 physical sciences Materials Chemistry Ceramics and Composites Ferrite (magnet) 0210 nano-technology Superparamagnetism |
| Zdroj: | Ceramics International. 46:2523-2529 |
| ISSN: | 0272-8842 |
| Popis: | This study aimed to investigate the effect of the Sm3+ substitution/SmFeO3 phase in Ni0.2Cu0.2Zn0.6Fe2-xSmxO4 ferrite. The Ni0.2Cu0.2Zn0.6Fe2-xSmxO4 (x = 0, 0.02, 0.05, 0.08, and 0.1) ferrite compositions were prepared by a sol-gel auto-combustion route. These ferrite compositions were investigated by X-ray diffraction (XRD), Mossbauer spectra, scanning electron microscope (SEM), and magnetic hysteresis curve. The XRD results confirmed the presence of hematite Fe2O3 in Ni0.2Cu0.2Zn0.6Fe2O4 calcined at 950 °C for 3 h and the SmFeO3 phase with the substituted limit of Sm3+ ions up to x = 0.05. The lattice parameter and average crystalline size depend on the synergistic effect of Sm3+ ion radius and compressive pressure of SmFeO3. The 57Fe Mossbauer spectra at 295 K indicated the process of the transformation of SmFeO3 phase and the variation in Fe3+–O2-–Fe3+ and Fe3+–O2-–Sm3+ superexchange interaction, where the hyperfine parameters were determined with a ferromagnetic order at the critical content of x = 0.08. Furthermore, the Mossbauer spectra and magnetism measurement (coercive value close to zero) of the substituted specimens revealed the superparamagnetic phase. The saturation magnetization (Ms) inhibited the dependence of Sm3+ ion content with a maximum of 53.7 emu/g at x = 0.05 and then decreased rapidly. |
| Databáze: | OpenAIRE |
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