Microstructure and properties of the Ba_(0.75-x)Ca_xLa_(0.25)Fe_(11.6)Co_(0.25)Ti_(0.15)O_(19) hexaferrites

摘要

AbstractIn the case of Ti4+remain unchanged, the Ca2+substituted Ba0.75−xCaxLa0.25Fe11.6Co0.25Ti0.15O19(0 ≤ x ≤ 0.05) were prepared by conventional solid-state reaction method at temperature of 1280 °C. A ball-to-power weight ratio of 10:1. Their crystal structure and magnetic properties were mainly investigated. The results show that the single magnetoplumbite phase structure transformed into the multiphase structure. Meanwhile, the small amount of α-Fe2O3phase existed in M-type phase. The micrographs were observed by a field emission scanning electron microscopy (SEM). Vibrating sample magnetometer (VSM) was used to analyze the magnetic properties. The saturation magnetization (Ms) first increases then decreases whenxfrom 0 to 0.03. But, whenxfrom 0.03 to 0.05, the saturation magnetization (Ms) first increases then decreases too. The maximum value is atx = 0.04 (Ms = 70.73 emu/g). The value of coercivity (Hc) first increases then decreases whenxfrom 0 to 0.04. But, the value increased whenxfrom 0.04 to 0.05. The maximum value is atx = 0.02 (Hc = 1691 Oe).