Annealing temperature effect on structural, vibrational and optical properties of Co0.8Ni0.2Fe2O4 nanoparticles

1st Materials Research Society Indonesia Conference and Congress

Utomo, J.^1 ; Agustina, A.K.^1 ; Suharyadi, E.^1

Department of Physics, Gadjah Mada University, North-Sekip-BLS-Yogyakarta

55281, Indonesia^1

关键词: Annealing temperature effects;    Annealing temperatures;    Coprecipitation method;    Cubic structure;    Gap energy;    Tetrahedral sites;    Vibration bands;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/432/1/012033/pdf
DOI  :  10.1088/1757-899X/432/1/012033

来源: IOP

【 摘 要 】

Co0.8Ni0.2Fe2O4 nanoparticles were synthesized by coprecipitation method and annealed at different temperatures (200, 400, 600, 800 and 1000 °C). The X-ray diffraction (XRD) exhibited the formation of spinel cubic structure. The crystallite size of Co0.8Ni0.2Fe2O4 nanoparticles at the annealing temperature of 200 °C was 7.0 nm and then increased with the increase of annealing temperature. The reason for this is that the particles grow faster and larger at a higher temperature. The transmission electron microscopy (TEM) images showed that the size distribution of the particles was increased with the increase of annealing temperature. It was also seen from the samples that most of the particles appeared nearly spherical in shape with slight agglomeration, particularly at higher annealing temperature. The Fourier transform infrared spectroscopy (FTIR) spectra of Co0.8Ni0.2Fe2O4 nanoparticles confirmed the presence of vibration bands of metal ions at 370.30 - 401.9 cm-1 and 586.36 - 601.79 cm-1 which was in a region of octahedral and tetrahedral sites, respectively. The values of the gap energy of Co0.8Ni0.2Fe2O4 nanoparticles observed ultraviolet-visible (UV-Vis) spectroscopy were in the range of 4.25 - 4.94 eV. The gap energy was decreased with the increase of annealing temperature and the increase of crystallite size.