Impact of grain size and structural changes on magnetic, dielectric, electrical, impedance and modulus spectroscopic characteristics of CoFe 2 O 4 nanoparticles synthesized by honey mediated sol-gel combustion method

作者：Raghvendra Singh Yadav, Ivo Kuřitka, Jarmila Vilčáková, Jaromír Havlica, Jiří Másilko, Lukáš Kalina, Jakub Tkácz, Jiří Švec, Vojtěch Enev, Miroslava Hajdúchová · 发表于：Advances in Natural Sciences Nanoscience and Nanotechnology · 年份：2017 · DOI：10.1088/2043-6254/aa853a · 被引用次数：279 · 研究领域：Magnetic Properties and Synthesis of Ferrites、Electromagnetic wave absorption materials、Multiferroics and related materials

In this work CoFe 2 O 4 spinel ferrite nanoparticles were synthesized by honey mediated sol-gel combustion method and further annealed at higher temperature 500 °C, 700 °C, 900 °C and 1100 °C. The synthesized spinel ferrite nanoparticles is investigated by x-ray diffraction, Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis/differential scanning calorimetry (TGA/DSC), field emission scanning electron microscopy, x-ray photoelectron spectroscopy and vibrating sample magnetometer. The x-ray diffraction study reveals face-centered cubic spinel cobalt ferrite crystal phase formation. The crystallite size and lattice parameter are increased with annealing temperature. Raman and Fourier transform infrared spectra also confirm spinel ferrite crystal structure of synthesized nanoparticles. The existence of cation at octahedral and tetrahedral site in cobalt ferrite nanoparticles is confirmed by x-ray photoelectron spectroscopy. Magnetic measurement shows increased saturation magnetization 74.4 emu g −1 at higher annealing temperature 1100 °C, high coercivity 1347.3 Oe at lower annealing temperature 500 °C, and high remanent magnetization 32.3 emu g −1 at 900 °C annealing temperature. The magnetic properties of synthesized ferrite nanoparticles can be tuned by adjusting sizes through annealing temperature. Furthermore, the dielectric constant and ac conductivity shows variation with frequency (1–10 7 Hz), grain size and cation redistributio...