Neutron diffraction study on the medium and short-range order of ternary chalcogenide glasses

• Published in: Journal of materials science Vol. 34; no. 15; pp. 3669 - 3676
• Main Authors: NEOV, S, GERASIMOVA, I, SKORDEVA, E, ARSOVA, D, PAMUKCHIEVA, V, MIKULA, P, LUKAS, P, SONNTAG, R
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.08.1999; Springer Nature B.V
• Subjects: Chalcogenides; Condensed matter: structure, mechanical and thermal properties; Crystals; Disordered solids; Distribution functions; Exact sciences and technology; Glasses; Materials science; Neutron diffraction; Neutron spectra; Neutrons; Physics; Pyramids; Radial distribution; Short range order; Structure of solids and liquids; crystallography; Tetrahedra; Order; Inorganic compounds; Arsenic sulfides; Neutron diffraction; Ternary compounds; Germanium sulfides; Experimental study; Germanium selenides; Chalcogenide glasses; Arsenic selenides; Antimony sulfides; Solid solutions; Short-range order; Chemical composition; Antimony selenides; Amorphous state structure
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1023/A:1004699205414

Glasses from GexAs40−xS60, GexAs40−xSe60, GexSb40−xS60 and GexSb40−xSe60 families have been investigated by neutron diffraction. The well expressed “first sharp diffraction peak” of the neutron spectra at Q = 10–14 nm−1 has been explained by a pseudo-binary model of the structure of studied chalcogenide glasses. The amplitude of this interference maximum increases with Ge-content in all investigated samples. Experimental radial distribution functions show that the basic structural units, GeS(Se)4 tetrahedra and As(Sb)S3 or As(Sb)Se3 pyramids persist in glassy state for the whole range of studied compositions. Crystal-like model distribution functions have been used to describe the short-range order observed. A shortening of heteropolar bonds in S-containing glasses as well as an increase of heteropolar bonds length in Se-containing glasses has been found.