Al3+-doped Ni-Zn ferrites were prepared using pure Fe2O3, NiO, ZnO and Al2O3 as raw materials, Bi2O3 as sintering additive, MnCO3 as extra dopant, PVA as binder, and Davon C as dispersant. The formation temperatures of spinel ferrites and optimum sintering temperatures of Ni-Zn ferrites with different contents of doped Al3+ were investigated. It was discovered that, with the increasing of doped Al3+, the formation temperatures of corresponding spinel ferrites and their lowest sintering temperatures would increase; the ferrites with Zn2+ were easier to be sintered than the ferrites without Zn2+ with the same amount of doped Al3+; and the ferrites with Zn2+ were more stable than the ferrites without Zn2+ under the same sintering temperature. Although the doping amounts of Al3+ were different, all the Al3+-doped Ni-Zn ferrites could be sintered at temperatures in the range of 1150 similar to 1550 degrees C by one-step synthesis sintering method, resulting in products with only spinel phase ferrite.
