Intermediate Phase in GexSe1−x Glasses: A Joint Theoretical and Experimental Study

An intermediate phase in GexSe1−x glasses: experiment and simulation

The pair correlation function for GexSe1−x alloys near the intermediate phase (IP) is reported. First-principles MD models of these alloys show a ‘selforganized’ phase associated with the number of Ge bonds with twofold Se atoms. This probably represents the IP of Boolchand. The self-organization involves maintaining a nearly constant number of twofold Se atoms bonded to one Ge atom through a r...

Macroscopic phase separation of Se-rich (x < 1/3) ternary Agy(GexSe1−x)1−y glasses

Temperature modulated differential scanning calorimetry measurements on Agy(GexSe1−x )1−y glasses provide evidence for bimodal glass transition temperatures in Se-rich glasses (x < 1/3). At x = 0.20 and 0.25, thermal measurements performed as a function of Ag content in the 0 y 0.25 range reveal that the additive (Ag) segregates into an Ag2Se-rich glass phase, possessing a characteristic glass ...

Intermediate Phase in Germanium - Selenide glasses : A Theoretical and Experimental Study

The Intermediate Phase in Ternary GexAsxSe1-2x Glasses

Melt-quenched AsxGexSe1-2x glasses over the composition range, 0 < x < 0.26, are examined in Raman scattering, T-modulated Differential Scanning Calorimetry (MDSC), and Sn Mossbauer spectroscopy measurements. The non-reversing enthalpy near Tg, ∆Hnr(x), accessed from MDSC shows a global minimum (~ 0) in the xc(1) = 0.09 < x < xc(2) = 0.16 range, and increases by an order of magnitude both at x ...

Light-induced giant softening of network glasses observed near the mean-field rigidity transition.

The longitudinal acoustic (LA) mode of bulk GexSe1-x glasses is examined in Brillouin scattering (BS) over the 0.15<x<1/3 range using near band-gap radiation (lambda=647.1 nm). The LA-mode frequency (nu(LA)) softens with increasing laser power in an athermal and reversible manner by nearly 30% (=Delta nu(LA)/nu(LA)) near x=x(c)=0.19(1) or mean coordination number, r(c)=2+2x(c)=2.38(2), close to...