Viscosity and elastic constants of amorphous Si and Ge

Viscosity and elastic constants of amorphous Si and Ge

The biaxial modulus and coefficient of thermal expansion of ion-beam-sputtered amorphous Si and Ge thin films were determined from curvature changes induced by differential thermal expansion. Viscous flow was measured by stress relaxation and was found to be Newtonian. The viscosity increased linearly with time as a result of structural relaxation, and its isoconfigurational activation enthalpy...

Athermal nonlinear elastic constants of amorphous solids.

We derive expressions for the lowest nonlinear elastic constants of amorphous solids in athermal conditions (up to third order), in terms of the interaction potential between the constituent particles. The effect of these constants cannot be disregarded when amorphous solids undergo instabilities such as plastic flow or fracture in the athermal limit; in such situations the elastic response inc...

Effect of mixed Ge/Si cross-linking on the physical properties of amorphous Ge-Si-Te networks

Comparison of the effect of Si and Ge presence on phase formation process, the structural and magnetic properties of Co2FeX (X=Ge,Si) Heusler compounds

In this study, the Co2FeX (X=Ge, Si) Heusler compounds with 30 valence electrons, which are made by using mechanical alloying and arc melting methods were studied. The crystallization of samples was confirmed by XRD data in both manufacturing methods. The results showed that the presence of Si than Ge in the compound played a more effective role to creation a large scale atomic ordering, and th...

Comparative STM and RHEED studies of Ge/Si(001) and Si/Ge/Si(001) surfaces

Although epitaxial growth has been traditionally monitored by reciprocal space techniques, such as reflection highenergy electron diffraction (RHEED), the development of surface-sensitive imaging techniques, such as scanning tunneling microscopy (STM), allows for monitoring in the real-space. RHEED averages information over relatively large sample regions, and is thus more representative of the...