摘要
用扩展X射线吸收精细结构(EXAFS)方法对氟氯混合卤化锰玻璃(60-x)MnF_2·40BaCl_2·xMnCl_2(x=0,10,20,30)中Mn^(2+)的近邻配位进行了研究。结果表明,同玻璃中两种阴离子的平均比值F/Cl相比Mn^(2+)近邻相对偏聚了F,而且随着MnCl_2的引入这种相对偏聚更明显。依据实验事实,对照MnF_2·BaF_2系氟化物玻璃的一种结构模型,指出了MnF_2-BaCl_2系氟氯混合卤化锰玻璃的结构特点,很好地解释了卤化锰系玻璃的形成规律和氟离子导电机理。
The local enviroment of Mn^(2+) has been determined by EXAFS for some polyhalide glasses (60-x)MnF_2·40BaCl_2·xMnCl_2 with x=0, 10, 20, 30. The first neigborhood coordination numbers derived from the study of Mn K absorption edge EXAFS show that F atoms were gathered preferentilly around Mn^(2+) in comparsion with the mean value of F/Cl in the glasses, and the degree of gathering increases with increasing Cl^- content in the glass. Based on the results we put forward a structural model for halide manganese glass, which enable us to explain the glass-forming characteristics and fluorineion conductivity more satisfactorily
出处
《武汉大学学报（自然科学版）》
CSCD
1993年第2期27-32,共6页
Journal of Wuhan University(Natural Science Edition)
关键词
EXAFS
玻璃结构
卤化锰系玻璃
halide manganese glass, glass structuer, EXAFS, glass-forming characteristics, fluoridion conductivity
