Amorphous Ge₂Sb₂Te₅ (GST) alloy, upon heating crystallize to a metastable NaCl structure around 150°C and then to a stable hexagonal structure at high temperatures (≥250°C). It has been generally understood that the phase change takes place between amorphous and the metastable NaCl structure and not between the amorphous and the stable hexagonal phase. In the present work, it is observed that t...

Zr80Pt20 alloys may form meta-stable quasicrystals either during devifxification of an amorphous phase or directly upon cooling from a liquid depending on processing conditions. To date, little attention has been given to the role of oxygen on the glass formation or devitrification behavior of Zr-Pt and similar alloys. This study reveals that oxygen content during melt spinning indeed strongly ...

Ballistic phonon transport was observed in Si films containing Ge nanodots. In SiGe nanodots, thermal conductivity drastically reduced close to that of amorphous materials due alloy scattering and nanodot scattering.

The effect of minor additions of Gd and Sm on the glass-forming ability (GFA) of Cu-Zr-Al alloys is investigated here. The rationale for these additions is the fact that the atomic size distribution can increase GFA by changing the topology of the alloy as a function of cluster stability, which is tied to the electronegativity and ionic and covalent nature of alloys. Ingots with nominal composi...

The amorphous to crystalline transformation in Fe78Tm2B20 (Sample S1) and Fe76Tm4B20 (Sample S2) alloys has been carried out using Differential Scanning Calorimetry (DSC). Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) of the samples are also discussed to confirm the complete crystallization after heating. DSC analysis of the samples S1 and S2 showed that on heating...

Nanoporous structures were fabricated from Fe76Si₉B10P₅ amorphous alloy annealed at 773 K by dealloying in 0.05 M H₂SO₄ solution, as a result of preferential dissolution of α-Fe grains in form of the micro-coupling cells between α-Fe and cathodic residual phases. Nanoporous Fe-Si-B-P powders exhibit much better degradation performance to methyl orange and direct blue azo dyes compared with gas-...