Pulsed neutron diffraction study of the short range structure in amorphous arsenic chalcogenides

✍ Scribed by Y Iwadate; T Hattori; S Nishiyama; K Fukushima; Y Mochizuki; M Misawa; T Fukunaga

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 165 KB
• Volume: 60
• Category: Article
• ISSN: 0022-3697
• DOI: 10.1016/s0022-3697(99)00159-6

✦ Synopsis

The pair distribution functions G(r)'s of As 2 S 3 and As 2 Se 3 glasses were obtained from the structure factors S(Q)'s. The structural parameters were refined by applying the correlation method in the (Q,Q•i(Q)) space. Although the structural parameters by PND were somewhat different from those by XRD, the peak shape in PND was clearer than in XRD. The local structure of the glasses was similar to that of orpiment (As 2 S 3 crystal) with AsS 3 pyramids. However, the nearest neighbor distances of As-S pair were 2.29 A ˚in PND, 2.27 A ˚in XRD, and 2.25 A ˚(average value of As-S bonds in crystal), implying the little expansion of AsS 3 -type pyramids and the variation in linkage of pyramids.