Abstract
Samples with small amounts of V 2O 5 (0, 0.5, 1.0, 2.0, 2.5 wt%, respectively) were prepared via ball-milling and two-step sintering from commercial powders (i.e., Fe 2O 3, NiO and V 2O 5). Micro-structural features, phase transformation, sintering behavior and magnetic properties of V 2O 5-doped NiFe 2O 4 composite ceramics have been investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermal dilatometer and vibrating sample magnetometer (VSM), respectively. Morphology and the detecting result of thermal dilatometer show that V 2O 5 can promote sintering process, the temperature for 2.5 wt% V 2O 5-doped samples to reach the maximum shrinkage rate is 59 °C lower than that of un-doped samples. With an increase of V 2O 5 from 0 wt% to 2.5 wt%, the apparent activation energy decreased from 813.919 kJ/mol to 298.806 kJ/mol. The early-stage synthesis process of un-doped ceramic samples and 2.5 wt% V 2O 5-doped samples are mainly controlled by grain boundary diffusion and volume diffusion, respectively. Increasing V 2O 5 content, residual magnetization ratio (Mr/Ms) and coercivity (Hc) elevate, meanwhile, saturation magnetization decreases.
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