【摘要】 以 ＦｅＳＯ_４·７Ｈ_２Ｏ和ＮｉＳＯ_４·７Ｈ_２Ｏ为原料，先制备颗粒细小的碱式碳酸盐前驱体，在 ３００～７００℃焙烧１ｈ后，制备出铁酸镍纳米晶，粒度均匀，粒径为８～５４ｎｍ．用非共线磁结构理论解释了铁酸镍纳米晶的比饱和磁化强度ｓ与比表面积Ｓａ之间的经验关系式，得到纳米晶的非共线表面层的厚度更多还原

【Abstract】 A basic carbonate precursor with very fine particles was synthesied by using FeSO₄.7H₂O and NiSO₄.7H₂O. NiFe₂O₄ nanocrystallites were then obtained by calcining the precursor. The results of XRD and TEM analysis showed the NiFe₂O₄ nanocrystallites with spherical shape were even, and their average diameters increased from sum to 54um when the precursor was calcined in the range of temperature from 300℃ to 700℃ for 1h. The specific saturation magnetization s and specific surface area Sa were measured. A empirical formula was obtained which can be interpreted very well by a noncollinear magnetic structure model, and the value of the canted-layer thickness was deduced.更多还原