卤化锰系玻璃结构的EXAFS研究

卤化锰系玻璃结构的EXAFS研究 STUDY ON STRUCTURES OF HALIDE MANGANESE GLASSES BY EXAFS 卢朝靖 Lu Chaojing 1 2 3 first-author 田德诚 Tian Dechen 1 2 3 戴国钧 Dai Guojun 1 2 3 张诚善 Zhang Chengshan 1 2 3 武汉大学物理学系 武汉大学物理学系 Department of Physics, Wuhan University Department of Physics, Wuhan University 武汉大学红外材料研究室,武汉 武汉大学红外材料研究室,武汉 ,430072 ,430072 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 EXAFS 玻璃结构 卤化锰系玻璃 形成特点 氟离子导电机理 halide manganese glass glass structuer EXAFS glass-forming characteristics fluoridion conductivity O723.6;O754 1993-02-01 2021-04-01 2