No abstract available

No abstract available

[en] YbAs₄S₇ compound is observed in films of the As₂S₃-Yb system. Films of this composition can be prepared by interaction of glass-like As₂S₃ films and polycrystalline ytterbium and simultaneous evaporation of As₂S₃ and ytterbium on the NaCl substrate at 200degC

[en] The problem aimed at preparation of the films of As₂S₃-Yb system, at studying their substructure depending on condensation conditions and defining noncrystallinity region of this system in the film state, is formulated. It is shown that in representative samples of As₂S₃-Yb system the vitrification region is extended up to 7 at.% Yb, in the films noncrystallinity region is extended up to 30 at.% Yb. With up to 30 at.% increase of ytterbium amount in initial alloys a tendency to crystallization in amorphous condensate structure is noticed. In evaporation of As₂S₃ + 40 at.% Yb and As₂S₃ + 50 at.% Yb, unknown in the film state YbAs₂S₄, Yb₃As₄S₉ and YbAs₄S₇ phases are prepared, and the latter is formed in case of As₂S₃ + 50 at.% Yb alloy at small evaporation rates (∼10 A/s). Substructure of As₂S₃ + 50 at.% Yb alloy prepared condensate is more dependent on evaporation rate than in evaporation of As₂S₃ + 40 at.% Yb alloy. In this case, evaporation rates being ∼ 100 A/s, the condensate has a polycrystal structure, and at small rates of ∼ 10 A/c, condensate structure is primarily blocked

[en] Phase formation in As₂Se₃-Yb system films is studied Films of YbAs₄Se₇, YbAs₂Se₄ and YbAsSe₃ composition were produced. The indicated phases are formed in films at significantly lower temperature than in bulky samples