材料科学与工程
材料科學與工程
재료과학여공정
MATERIALS SCIENCE AND ENGINEERING
2001年
1期
86-89
,共4页
方道来%郑翠红%朱伟长%晋传贵
方道來%鄭翠紅%硃偉長%晉傳貴
방도래%정취홍%주위장%진전귀
铁酸镍%纳米晶%表面效应%比饱和磁化强度
鐵痠鎳%納米晶%錶麵效應%比飽和磁化彊度
철산얼%납미정%표면효응%비포화자화강도
以FeSO4*7H2O和NiSO4*7H2O为原料，首先制备出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，粒径为8～54nm，粒度均匀。通过测量它的比饱和磁化强度σs与比表面积Sa，得出经验公式σs(Sa)=σs(∞)(1-aSa)，运用非共线磁结构理论很好地解释了上述经验公式，并得到纳米晶的非共线表面层的厚度。
以FeSO4*7H2O和NiSO4*7H2O為原料，首先製備齣顆粒細小的堿式碳痠鹽前驅體，在300～700℃焙燒1h後，製備齣鐵痠鎳納米晶，粒徑為8～54nm，粒度均勻。通過測量它的比飽和磁化彊度σs與比錶麵積Sa，得齣經驗公式σs(Sa)=σs(∞)(1-aSa)，運用非共線磁結構理論很好地解釋瞭上述經驗公式，併得到納米晶的非共線錶麵層的厚度。
이FeSO4*7H2O화NiSO4*7H2O위원료，수선제비출과립세소적감식탄산염전구체，재300～700℃배소1h후，제비출철산얼납미정，립경위8～54nm，립도균균。통과측량타적비포화자화강도σs여비표면적Sa，득출경험공식σs(Sa)=σs(∞)(1-aSa)，운용비공선자결구이론흔호지해석료상술경험공식，병득도납미정적비공선표면층적후도。
A basic carbonate precursor with very fine particles was synthesied by using FeSO4*7H2O and NiSO4*7H2O, and NiFe2O4 nanocrystallites were then obtained by calcining the precursor. The results of XRD and TEM analysis show the NiFe2O4 nanocrystallites with spherical shape are even, and their average diameters increase from 8nm to 54nm when the precursor is calcined at 300—700℃ for 1h. Their specific saturation magnetization σs and specific surface area Sa were measured. A empirical formula σs(Sa)=σs(∞)(1-aSa)was obtained which can be interpreted very well by a noncollinear magnetic structure model, and the value of the canted-layer thickness was deduced.
