Cu$^{2+}$ and Al$^{3+}$ co-substituted cobalt ferrite: structural analysis, morphology and magnetic properties

Bulletin of Materials Science

关键词: Magnetic properties;    chemical synthesis;    XRD;    spinel ferrites;    haematite;    VSM.;   

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Cu–Al substituted Co ferrite nanopowders, Co$_{1−x}$Cu$_x$Fe$_{2−x}$Al$_x$O$_4$ ($0.0 ≤ x ≤ 0.8$) were synthesized by the co-precipitation method. The effect of Cu–Al substitution on the structural and magnetic properties have been investigated. X-ray diffraction (XRD) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, field emissionscanning electron microscopy (FESEM) and vibrating sample magnetometer (VSM) are used for studying the effect of variation in the Cu–Al substitution and its impact on particle size, magnetic properties such as Ms and Hc. Cu–Alsubstitution occurs and produce a secondary phase, $\alpha$-Fe$_2$O$_3$. The crystallite size of the powder calcined at 800$^{\circ}$C was in the range of 19–26 nm. The lattice parameter decreases with increasing Cu–Al content. The nanostructural features were examined by FESEM images. Infrared absorption (IR) spectra shows two vibrational bands; at around 600 ($v_1$) and 400 cm$^{−1}$ ($v_2$). They are attributed to the tetrahedral and octahedral group complexes of the spinel lattice, respectively. It was found that the physical and magnetic properties have changed with Cu–Al contents. The saturation magnetization decreases with the increase in Cu–Al substitution. The reduction of coercive force, saturation magnetization and magnetic moments are may be due to dilution of the magnetic interaction.

【 授权许可】

CC BY