摘要
用ESCA测定了Na_2O含量为38、34、30、28(mol％)的三组Na_2O—SiO_2玻璃系列样品中的桥氧(O^b)和非桥氧(O^(nb))的O_(is)线间的化学位移及其相对含量。三组样品采用三种不同的方法制理其分析表面。实验表明,制备好玻璃的新鲜表面,防止外来氧的干扰,是该项测定的关键,Ar^+离子溅射不失为一种有效的制备方法;手套箱中,在N_2气氛中作人工断裂得到的新鲜断面,与超高真空(UHV)断裂台断裂的断面相比,具有几乎完全相同的分析效果。测定结果还表明,玻璃中的O^b和O^(nb)的O_(is)线能量间的化学位移是1.8～2.0eV,O^b在高结合能端,这与金子泰成和Bruckner的结果一致;其定量结果与人工配制含量吻合。
The chemical shift and relative content between bridging Oxygen (O^b)and non-bridging Oxygen (O^(nb)) were determined by ESCA for three groups of Na_2O-SiO_2 glass system, each group was made of four samples containing Na_2O 38, 34, 30, 28 (mol%) respectively. Three different methods were used to prepare the analytical surface of specimens for three different groups. Experiments shown that good preparation of fresh surface for preventing adventitious Oxygen from intereference is a key to this kind of determinations. For preparation of glass fresh surface,Ar^+ ion erosion method is good enough, and solid fracture in a glove box protected with inert gas N_2 flooding is as good as that with Fracture Stage under UHV condition. Results shown that the chemical shift between O_(is) lines of O^b and O^(nb) in Na_2O- SiO_2 glass is 1. 8～2. 0eV,O_(is) line energy for O^b is higher in binding energy. All these are in agreement with Bruckner's and Kanoko's. The quantification results of O^b and O^(nb) coincide with theoretical content of them in burden.
