Study of Structural and Magnetic Properties of Silica and Polyethylene Glycol (PEG-4000)-Encapsulated Magnesium Nickel Ferrite (Mg0.5Ni0.5Fe2O4) Nanoparticles

4th International Conference on Advanced Materials Science and Technology

Deswardani, F.^1 ; Maulia, R.^1 ; Suharyadi, E.^1

Department of Physics, Universitas Gadjah Mada, Sekip Utara BLS 21, Yogyakarta, Indonesia^1

关键词: Absorption peaks;    Coprecipitation method;    Fourier transform infra reds;    M-O bond;    Nickel ferrite;    Phase ratios;    Spinel phase;    Structural and magnetic properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/202/1/012047/pdf
DOI  :  10.1088/1757-899X/202/1/012047

来源: IOP

【 摘 要 】

Mg0.5Ni0.5Fe2O4has been successfully synthesized by using co-precipitation method. Two series of Mg0.5Ni0.5Fe2O4silica encapsulated have been prepared by varying the concentration of silica and variation of PEG-4000 concentration. Analysis of X-Ray Diffraction (XRD) pattern showed that nanoparticles contained Mg0.5Ni0.5Fe2O4spinel phase and γ-Fe2O3phase with a particle size of 5.1 nm. The various of silica encapsulation give rise to produce a new phase of SiO2and increase the particle size to 16.1 nm. PEG-4000 encapsulation affected to create a new phase of γ-FeO(OH), and reduce the particle size down to 4.5 nm. Fourier Transform Infra Red (FTIR) for Mg0.5Ni0.5Fe2O4showed absorption peaks around 300-600 cm-1which are M-O bond vibration. After silica encapsulation, there was new bond vibration typical of silica such as Si-O-Si (1049.28 cm-1), Si-OH (779.24 cm-1), and Si-O-Fe (570.93 cm-1). The PEG-4000 encapsulation creates a new vibration for typical of PEG-like of C-O (1103.28 cm-1) and C-H (925.83, 1481.33, and 2924.09 cm-1). Both of encapsulations series have M-O bond vibration indicating the presence of Mg0.5Ni0.5Fe2O4. After silica encapsulation, the coercivity of Mg0.5Ni0.5Fe2O4decreased from 47 Oe to 10 Oe due to the decrease of particle size. Even though, the discrepancy of particle size as the effect of PEG-4000 encapsulation, the coercivity just slightly reduced to 46 Oe. The saturation magnetization of Mg0.5Ni0.5Fe2O4decreased from 4.7 emu/g to 1 emu/g after silica encapsulation because diamagnetic SiO2. Otherwise, the saturation magnetization increased to 7.7 emu/g after PEG-4000 encapsulation because of domination of Mg0.5Ni0.5Fe2O4phase ratio.