Dual chemical role of Ag as an additive in chalcogenide glasses
M Mitkova, Y Wang, P Boolchand - Physical Review Letters, 1999 - APS
M Mitkova, Y Wang, P Boolchand
Physical Review Letters, 1999•APSAbstract Ternary (Ge x Se 1− x) 1− y Ag y bulk glasses in the Se-rich region (x< 1 3) are
shown to be intrinsically phase separated into an Ag 2 Se-rich glass and a residual Ge t Se
1− t backbone (t> x at y≠ 0) with Ag acting as a network modifier. The existence of an Ag 2
Se glass with a T g= 230 C is explained quantitatively in terms of constraint counting
algorithms. In contrast, Ge-rich glasses (x≥ 2 5) are homogeneous, wherein Ag acts as a
network former, replacing available Ge sites of the backbone to be 3-fold coordinated to Se.
shown to be intrinsically phase separated into an Ag 2 Se-rich glass and a residual Ge t Se
1− t backbone (t> x at y≠ 0) with Ag acting as a network modifier. The existence of an Ag 2
Se glass with a T g= 230 C is explained quantitatively in terms of constraint counting
algorithms. In contrast, Ge-rich glasses (x≥ 2 5) are homogeneous, wherein Ag acts as a
network former, replacing available Ge sites of the backbone to be 3-fold coordinated to Se.
Abstract
Ternary (Ge x Se 1− x) 1− y Ag y bulk glasses in the Se-rich region (x< 1 3) are shown to be intrinsically phase separated into an Ag 2 Se-rich glass and a residual Ge t Se 1− t backbone (t> x at y≠ 0) with Ag acting as a network modifier. The existence of an Ag 2 Se glass with a T g= 230 C is explained quantitatively in terms of constraint counting algorithms. In contrast, Ge-rich glasses (x≥ 2 5) are homogeneous, wherein Ag acts as a network former, replacing available Ge sites of the backbone to be 3-fold coordinated to Se.
American Physical Society