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把r-Fe_2O_3磁粉放入Co~(+2)/Fe~(+2)之比0.5的碱液中,加热到90℃进行处理。所得的磁粉矫顽力随Co~(+2)含量增加而提高,当Co~(+2)的含量为7％(重量比)时,矫顽力可达900奥斯特。颗粒呈针状。经过在碱溶液中热处理之后,并未发现形态上的明显变化。要求钴—铁氧体在r-Fe_2O_3颗粒的表面外延结晶。其矫顽力的增加归于钴—铁氧体的磁性各向异性。与铁被钴离子均匀取代的那些磁粉相比。通过在60℃的温度下退火(焙烧),矫顽力变化和复印效应都不大。这种稳定性被认为是在r-Fe_2O_3粒子表面存在着较高浓度的钴离子,而且钴离子的移动又极为困难的缘故。
The r-Fe 2 O 3 magnetic particles were placed into a lye of Co ~ (+2) / Fe ~ (+2) 0.5 and heated to 90 ℃ for treatment. The coercivity of the obtained magnetic powder increases with the increase of Co ~ (+2) content, and the coercive force can reach 900 Oe when the content of Co ~ (+2) is 7% by weight. Particles acicular. After the heat treatment in alkaline solution, no significant morphological changes were found. The cobalt-ferrite is required to epitaxially crystallize on the surface of r-Fe 2 O 3 particles. The increase of coercivity is attributed to the magnetic anisotropy of cobalt-ferrite. Compared with those magnetic powders whose iron is uniformly replaced by cobalt ions. By annealing (baking) at a temperature of 60 ° C, the coercive force variation and the copying effect are not large. This stability is believed to be due to the presence of higher concentrations of cobalt ions on the surface of the r-Fe_2O_3 particles and the extremely difficult movement of cobalt ions.