Abstract
TiO2‐doped NiFe2O4 samples were prepared via ball‐milling and two‐step sintering processes. Besides NiFe2O4 phase, two new phases, NiTiO3 and Fe2TiO5, formed in TiO2‐doped samples. The temperature of sintering onset for 1.0 wt% TiO2‐doped samples is 230°C lower than that of undoped samples. Early‐stage synthesis process of TiO2‐doped NiFe2O4 ceramics is controlled by grain boundary diffusion mechanism. Increasing TiO2 content from 0 to 1.0 wt%, the apparent activation energy decreased from 813.919 KJ/mol to 639.361 KJ/mol. The values of relative density and bending strength reached their maximum value with 1.0 wt% TiO2. Saturation magnetization, residual magnetization ratio and coercivity decrease with increasing TiO2 content.
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