Preparation of Nanosized Ca-Zn Ferrite Particles by a Sol-Gel Method and its Magnetic Properties
A sol-gel process was used to synthesize nanosized Ca-Zn ferrite powders. DTA-TG, XRD and SEM techniques are employed to investigate the thermal decomposition of the dry gel, phase composition and microstructure of nanosized ferrite particles. The results revealed that the Ca0.4Zn0.6Fe2O4 phase appeared while calcined the gel powders at 300 °C for 2 hrs, and the Ca0.4Zn0.6Fe2O4 crystalline can be formed completely at 400 °C. Hysteresis loop indicated that the nanocrystallites size has great influence on the magnetic properties, which leads to the increase of the specific saturation magnetization and the decrease in coercivity of the samples with increasing the particle size.
Wei Pan and Jianghong Gong
X. Xao, C. Qian, Z. Q. He, "Preparation of Nanosized Ca-Zn Ferrite Particles by a Sol-Gel Method and its Magnetic Properties", Key Engineering Materials, Vols. 336-338, pp. 1999-2001, 2007