nanocrystals were characterized by X-ray diffraction, high-resolution transmission electron microscopy, Raman spectroscopy, magnetometry and Mössbauer spectroscopy, to understand their structure and magnetic properties. These CoFe2O4 nanoparticles have the smallest particle size reported ever, with a mean diameter of ∼3 nm. The coercivity was found to be larger compared to that reported in the literature
我们应用一般的非
水途径形成单,双,三,四,六足和多足尖晶石磁性
铁氧体金属氧化物(CoFe 2 O 4)纳米晶体。通过X射线衍射,高分辨率透射电子显微镜,拉曼光谱,磁力法和Mössbauer光谱对CoFe 2 O 4磁性纳米晶体进行了表征,以了解其结构和磁性。这些CoFe 2 O 4纳米粒子的粒径是有史以来最小的,平均直径约为3纳米。发现矫顽力比文献中球形颗粒的矫顽力大。Mössbauer光谱表明在室温以上会发生磁转变,其中20%的Fe离子会转变为顺磁性状态(约400 K)。根据磁性参数的热依赖性,估计阻断温度约为425K。这些研究表明我们的CoFe 2 O 4纳米晶体不同于它们的立方/球形晶体,它们通常显示出单畴特征。这些CoFe 2 O 4纳米晶体显示出强的形状各向异性依赖性的磁性。