摘要
从硒和砷的 K 层吸收边 EXAFS 谱研究了一系列组成为 Se-As(达50 at%)玻璃中硒和(?)的近程序结构,并同非晶硒、六方硒和α-单斜硒的 EXAFS 谱作了比较分析.a-Se 最近邻的配位数为2,近程Se-Se 键结合成较紧密的共价键,键长和α-单斜硒的键长很接近,为2.37(?)左右,比六方硒的 Se-Se键的长度稍短.随着 As 的增加,出现以 As 为中心的结构基团,玻璃内逐步形成 AsSe_(1.5)网络.
The nearby structure of selenium and arsenic in several Se-As glasses within the rangeof Se-As(50 at%)have been investigated by EXAFS spectra at the selenium K-edge and thearsenic K-edge.The EXAFS spectra of glassy selenium were compared with those of hexagonaland α-monoclinic selenium Experiments showed that the first cooperative layer of a-Se consistsof two selenium atoms,and the short range bond of Se-Se is of strong covalency,the length isabout the same as α-monoclinic selenium,2.37(?)or so,which is a little bit shorter than that ofhexagonal selenium,about the order of several percent.As the arsenic concentration is increased,structure groups of As as centre will be appearedand a polymeric network(As Se_(1.5))_n will be gradually formed.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第3期281-288,共8页
Journal of Inorganic Materials
关键词
硒
砷
玻璃
硫
玻璃结构
EXAFS
Arsenic-selenium glass
Structure of chalcogenide glass
EXAFS study
Radial structure function(RSF)
Nearest neighbour distance
