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包钴铁氧体型,γ-Fe2O3磁粉(简记为CoFe-γ-Fe2O3)是针状γ-Fe2O3磁粉与Co++和Fe++溶液起反应,在每个针状颗粒上包覆了一层钴铁氧体固溶体。经此种方法处理后的γ-Fe2O3磁粉的矫顽力及其它磁特性有较大的提高。如矫顽力由原来415Oe增加到715Oe;剩磁和矫顽力随时间及温度变化小等。我们利用穆斯堡尔效应并配合其它研究手段进行了研究,认为:CoFe-γ-Fe2O3磁粉矫顽力的提高,主要是由于γ-Fe2O3磁粉表面包覆了一层钴铁氧体固溶体,γ-Fe2O3与钴铁氧体固溶体之间发生磁耦合作用之故。The γ-Fe2O3 powder with CoxFe3-xO4-doped coating was obtained by reaction of the γ-Fe2O3 powder in the solutions containing Co++ and Fe++ ions. It was found that this epitaxial CoxFe3-xO4 coating raised the coercivity of the γ-Fe2O3 from 420 (Oe) to 715 (Oe).The epitaxial CoxFe3-xO4 coating was isvestigated by means of M?ssbauer Effect of 57Fe. The M?ssbauer Spectrum indicates that the surface of γ-Fe2O3 was doped with CoxFe3-xO4 solid solution, and a static magnetic interaction takes place between the γ-Fe2O3 matrix and CoxFe3-xO4 solid solution.
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