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纳米微晶是由纳米量级(1～100nm)晶粒构成的多晶物质.纳米微晶是由两种组元组成,其一为晶体组元,该组元中所有原子都位于晶格内的格点上;另一部分为界面组元,其原子都位于晶粒之间的界面上.由于纳米微晶物质的界面比大尺寸晶粒物质大得多,且晶体组元又远小于大尺寸晶粒物质,这样纳米微晶就表现出不同于普通晶体的结构特点和物理性质.纳米铁的磁性和Mǒssbauer谱的测量表明,纳米Fe的饱和磁化强度远小于大块α-Fe和非晶铁的饱和磁化强度,并且纳米Fe界面组分的居里温度T_c比大块多晶Fe低,这意味着
Nanocrystallites are polycrystalline materials composed of nanometer order (1 ~ 100nm) grains.The nanocrystallites are composed of two kinds of components, one of them is a crystal component, and all the atoms in the component are located in the crystal lattice Of the lattice points; the other part of the interface element, the atoms are located in the interface between the grains.As the nanocrystalline material interface is much larger than the large-size crystalline material, and the crystal unit is far smaller than the large size The results show that the nanocrystals show different structural and physical properties from those of ordinary crystals.The measurements of the magnetic and Mǒssbauer spectra show that the saturation magnetization of nanosized Fe is much less than that of bulk α-Fe and amorphous iron Saturation magnetization, and the Curie temperature T_c of the nano-Fe interface component is lower than that of bulk polycrystalline Fe, which means that