Crystallite size dependence on electrical properties of LaFeO3.0.1Fe3O4 nanocomposite material

International Symposium on Current Progress in Functional Materials

Rhidwan, I.^1 ; Triyono, D.^1 ; Laysandra, H.^1

Department of Physics, Faculty of Mathematics, Natural Sciences Universitas Indonesia, Kampus UI Depok, Depok

16424, Indonesia^1

关键词: Bode plots;    Higher frequencies;    Impedance spectroscopy;    Nyquist plots;    Relaxation peak;    Scherrer's formula;    Sintering methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/188/1/012058/pdf
DOI  :  10.1088/1757-899X/188/1/012058

来源: IOP

【 摘 要 】

LaFeO3.0.1Fe3O4nanocomposite was prepared by sintering method. LaFeO3was synthesized by the sol-gel method and mixed with Fe3O4. The mixture was pressed and then sintered at 1300°C for 1 h resulting nanocomposite. After that, LaFeO3.0.1Fe3O4nanocomposite was annealed at temperatures of 1000°C, 1100°C, and 1200°C for 12 h. Structural analysis by using X-ray diffraction (XRD) confirm the double phase of LaFeO3and Fe3O4. The crystallite sizes calculated by using Scherrer's formula are in the range of 30-60 nm. By using impedance spectroscopy method, the electrical properties were evaluated as functions of frequency (1 kHz-1 MHz) and temperature (RT - 373 K). Electrical properties were represented in Nyquist plot and Bode plot as a function of temperature. Bode plot of Z" vs f shows that relaxation peaks shift to the higher frequency. From the plot of ln τ vs 1/T, the activation energy was calculated.