α－Fe_2O_3微晶表面层厚度的Mossbauer谱表征

MOSSBAUER CHARACTERIZATION OF THE SURFACE THICKNESS OF α-Fe_2O_3MICROCRYSTALS

α－Ｆｅ＿２Ｏ＿３微晶表面层厚度的Ｍｏｓｓｂａｕｅｒ谱表征苏兴才，王寅生（中国科学技术大学近代化学系，合肥２３００２６）姜继森（华东师范大学化学系，上海２０００６２）关键词：表面层厚度，α－Ｆｅ＿２Ｏ＿３微晶，谱物质表面分子所处环境不同于内部分子，表...

Mssbarer spectra of α-Fe_2O_3 Microcrystais before and after adsorbing oleic acid were measured at room temperature and fitted by computer The results show that the area fraction of the surface iron ions. It is inferred that the surface layer of the α-Fe_2O_3 microcrystals of which Mssbauer properties differ from those of the bulk phase is about 20 thick . After adsorbing oleic acid、the surface thickness becomes thinner .this shows that the influence of the adsorbed molecules on α-Fe_2O_3 reaches a certain depth inside the microcrystals.