【摘要】 本文报告了用Mossbauer谱研究非正分氧化铁微粉各向异性常数的结果。微粒粒径～10nm。室温时,非正分氧化铁微粉样品回火处理前后Mossbauer谱的超顺磁分数(面积)和铁磁分数(面积)比例不变,但电四极劈裂值则有明显的变化。据此认为,不完全氧化时晶格畸变诱生的各向异性导致了非正分氧化铁粉末矫顽力的反常增大。更多还原

【Abstract】 The anisotropy constant of nonstoichiometric iron oxide powder has been studied by Mossbuer spectroscopy. The diameter of the powder was about 10 nm. At room temperature, the area ratio of the paramagnetic fraction to the ferromagnetic fraction of Mos-sbauer spectra before and after aging treatment was almost unchanged, but the quadrupole value was drastically changed, which suggested that the anomalous increasing of coercivi-ty in nonstoichiometric powder should be due to the additional anisotropy induced by lattice distortion after partial oxidation of samples.更多还原