Effect of annealing temperature on negative magnetization behavior in CoCuCrO ceramics.

CoCuCrO ceramics have been synthesized using the sol-gel method. Through annealed at different temperatures, all the samples are pure formation with cubic crystal structure proved by X-ray diffraction. A significant annealing temperature dependence of negative magnetization has been recorded. With increasing annealing temperature, the absolute values of maximum and minimum of the field-cooled magnetization show a monotonous increase. The relative intensity of negative magnetization is enhanced from 750 to 900 °C and then weakened with further increasing the annealing temperature. The relationship between annealing temperature and negative magnetization can be attributed to the particle growth during the annealing process. In addition, magnetic field dependence of magnetization at 10 K is also studied with different annealing temperatures and the crystallographic microstructure has an important effect on the magnetization. Graphical Abstract: Temperature dependence of magnetization in ZFC and FC processes of CoCuCrO ceramics annealed at 750 °C. Inset is the FC inverse susceptibility and the fitting of ferrimagnetic Curie-Weiss law down to nearly T . Experimental result is plotted as circle, and the fitting is presented as the solid line. [ABSTRACT FROM AUTHOR]