Co-γ-Fe_2O_3中包钴层的TEM研究

TEM study of cobalt ferrite epitaxial layer on Co γ Fe 2O 3 particles. Journal of Zhejiang Agricultural University

用自穿孔方法制得了Ｃｏ－γ－Ｆｅ２Ｏ３作高分辨电镜分析用的火棉胶微栅支持膜。对磁粉颗粒的ＥＤＳ线扫描表明Ｃｏ铁氧体主要分布在以γ－Ｆｅ２Ｏ３为芯的表面层，高分辨电子显微像表明表面层Ｃｏ铁氧体的结晶方向为［１１０］平行于长轴，其厚度在２ｎｍ左右，ＣｏＦｅ２Ｏ４外延生长取向并非与芯部γ－Ｆｅ２Ｏ３完全一致。

The collodion micro grid as Co γ Fe 2O 3 support membrance was made by self perforated. The micro grid is well suited support membrance for HREM of very tiny particle. With the EDS line scan of Co γ Fe 2O 3, it was found that the cobalt ferrite was crystallited on the surface of core γ Fe 2O 3 particles. HREM showed that cobalt ferrite was crystallited epitaxially along the direction parallel to the direction of the needle axis of core γ Fe 2O 3 particles. The thickness of CoFe 2O 4 layer is about 2 nm.