“…In comparison, phase separation into silver-rich and silver-poor glassy phases has been observed for the Ag y (Ge x Se 1−x ) 1−y tie-lines (x = 0.20, 0.25) from scanning electron microscopy (SEM) [11,13,14], electric force microscopy (EFM) [1517] and conductive atomic force microscopy (C-AFM) [16] experiments, but the EFM and C-AFM results indicate a composition for the Ag rich phase that is not constant along a given tie-line. We note that two T g values were also found in MDSC work on samples of composition Ge 0.15 Se 0.85−y Ag y with 0 ≤ y ≤ 0.20 [53]. Multiple glass transitions were not, however, seen in DSC work on Ag y (Ge 0.25 Se 0.75 ) 1−y glasses [8,11,54] or in DSC work on glassy Ag 0.33 (Ge 0.2537 Se 0.7463 ) 0.67 (i.e.…”