Synthesis temperature and NaOH concentration dependences of microstructure and magnetic properties of MnNi-Fe2O4 nanoparticles

9th Annual Basic Science International Conference 2019

自然科学（总论）

Saputra, A.I.^1 ; Herdiman^1 ; Suharyadi, E.^1 ; Kato, T.^2 ; Iwata, S.^3

Department of Physics, Gadjah Mada University, Yogyakarta, Indonesia^1

Department of Electronics, Nagoya University, Japan^2

Institute of Materials and System for Sustainability, Nagoya University, Japan^3

关键词: Characteristic absorption;    Coprecipitation method;    Fourier transform infra reds;    Magnetic properties of nanoparticle;    Magnetization-saturation;    Synthesis temperatures;    Vibrating sample magnetometer;    X ray diffractometers;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/546/4/042041/pdf
DOI  :  10.1088/1757-899X/546/4/042041

学科分类：自然科学（综合）

来源: IOP

【 摘 要 】

MnNi-Fe2O4 nanoparticles have been successfully synthesized by coprecipitation method in different synthesis temperatures and NaOH concentrations. Microstructure and magnetic properties of nanoparticles were characterized by X-ray diffractometer (XRD), transmission electron microscope (TEM), fourier transform infra-red (FTIR) spectroscope, and vibrating sample magnetometer (VSM). X-ray diffraction patterns confirmed the formation of spinel structure with crystallite size in the range of 7.5 nm to 14.0 nm. The spectral analysis revealed two characteristic absorption bands related to metal-oxygen vibration in tetrahedral and octahedral site that appeared at 586 cm-1 and 432 cm-1, respectively. The magnetization saturation within the range of 3.0-8.1 emu g-1. The tendency to increase in coercivity from 6.5 to 17.5 Oe was due to the increase in synthesis temperature. The increase in NaOH concentration also affected coercivity to increase from 12.3 to 84.9 Oe.