关键词: 
纳米固体材料 /
穆斯堡尔谱学 /
原子结构 /
磁性

摘要: 一种新的纳米固体材料用穆斯堡尔方法已进行了研究.它们的结构可分为体积大致相近的两个部分,即晶粒与晶界,它们的穆斯堡尔参数有明显的不同.本文评述了对金属铁、γ-Fe_2O_3和α-Fe_2O_3晶粒所组成的纳米材料结构和磁特性的研究. Nanocrystalline materials have been proposed to present a new solid-state structurewhich exhibits neither long-range order (like crystals) nor short-range order (like glasses).They consistof two components with comparable volume fractions:a crystalline component and an interfacialcomponent.M(?)ssbauer spectroscopy has been used to investigate the atomic structure,the distributionof hyperfine field,superparamagnetism and interactions between interface and nanocrystal cores.