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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
FeSO 4 · 7H 2 O and NiSO 4 · 7H 2 O were used as raw materials to prepare small basic carbonate precursors. After calcined at 300 ~ 700 ℃ for 1 h, the nickel ferrite nanocrystals were prepared with uniform particle size of 8 ~ 54 nm . The non-collinear magnetic theory is used to explain the empirical relationship between specific saturation magnetization s and specific surface area Sa of nickel ferrite nanocrystals. The thickness of non-collinear surface layer of nanocrystal