Glass formation and properties of chalcogenide systems XXXI. RDF studies on the structure of vitreous GeS2 and GeSe2

High-frequency dynamics of vitreousGeSe2

“…Finally the tubes were filled with nitrogen at a pressure of 0.2 torr and sealed off. 27 The tubes were heated gradually in a furnace up to 1320 K for 6 h and then kept at this temperature for other 10 h. During this time, the tubes were shaken in order to guarantee the homogeneity of the melt and the complete mixing of the reactants. The furnace temperature was decreased to 1070 K and the tubes were extracted and then rapidly quenched in a water and ice mixture.…”

Characteristics of Photoconductivity in Amorphous GexSb10Se90—x Thin Films

“…The composition dependence of photo and dark conductivities illustrated in Fig. 3 can be explained with the help of the chemically ordered network model [13,15].…”

Glass Transition Temperature Variation as a Probe for Network Connectivity

“…Therefore, the local structure of these glass systems in the range [0.2,0.33] will be very close to the crystalline counterpart and each chalcogen will tend to be surrounded by two germanium atoms and vice-versa. In any case, the description in terms of random A-A and A-B bondings will become inappropriate (more and more A-B connections are possible), and the glass transition temperature will vary superlinearly, in systematic deviation with the [20], P -Se [21], Bi -Se [22] and As -Se [23]. The solid line represents the slope equation (17) with and The dashed and dotted lines correspond to the slope (41) taking into account four-fold coordinated species with a fraction of 0.3 and 0.5. predicted slope (17).…”