以分析纯Fe_2O_3、NiO、ZnO、Al_2O_3为原料,并适量配以烧结助剂,掺杂试剂、粘接剂和分散剂,磨细过筛后干压成陶瓷素坯,并一次烧结合成Ni-Zn铁氧体.研究了不同浓度Al3+掺杂Ni-Zn铁氧体的合成与烧结制度.发现Al~(3+)掺杂Ni-Zn铁氧体的合成和烧结具有很强的组成依赖性:随着掺杂Al3+浓度升高,铁氧体形成和烧结的温度升高;含锌铁氧体在相同掺杂Al~(3+)浓度下比纯镍铁氧体更容易烧结,且在更高温度下后者易形成新的非尖晶石相结构.随Al~(3+)掺杂浓度不同,Al~(3+)掺杂Ni-Zn铁氧体在1150～1550 ℃范围内可分别实现一次合成和烧结.
Al~(3+)-doped Ni-Zn ferrites were prepared using pure Fe_2O_3, NiO, ZnO and Al_2O_3 as raw materials, Bi_2O_3 as sintering additive, MnCO_3 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 Al~(3+) were investigated. It was discovered that, with the increasing of doped Al~(3+), the formation temperatures of corresponding spinel ferrites and their lowest sintering temperatures would increase; the ferrites with ZN~(2+) were easier to be sintered than the ferrites without ZN~(2+) with the same amount of doped Al~(3+); and the ferrites with ZN~(2+) were more stable than the ferrites without ZN~(2+) under the same sintering temperature. Although the doping amounts of Al~(3+) were different, all the Al~(3+)-doped Ni-Zn ferrites could be sintered at temperatures in the range of 1150～1550 ℃ by one-step synthesis sintering method, resulting in products with only spinel phase ferrite.
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