Analysis of the Grüneisen parameters of some fcc metals by an improved elastic force model

Abstract

A technique to improve the epitaxial growth of some fcc and bcc metals on rock salt An analysis of the temperature dependence of Griineisen parameters of copper, silver, gold, and aluminium is performed in terms of the elastic constants and their pressure derivatives by a new lattice dynamical model. The model satisfies the symmetry requirements of the lattice and the lattice is in eqUilibrium without recourse to external forces. The microscopic Griineisen parameters Yqj are calculated as a function of wave vector q, along the principal symmetry directions, (100), (110), (III), (210), (211), and (221), and the values are averaged over the wave vector space in the first Brillouin zone. For the evaluation of integrals, the modified Houston's method is used. The Griineisen parameters computed in our present study show reasonably satisfactory agreement with experimental measurements.

A finite temperature continuum theory based on interatomic potential in crystalline solids

“…4 Comparison of normalized adiabatic elastic constant C 12 from the current analysis and experimental data for various fcc metals: a Al, b Au and c Cu. Experimental data for Al, Au, and Cu are obtained from Sutton [45], Neighbours and Alers [46], and Overton and Gaffney [35], respectively followed by some contraction, followed by expansion again [42,43]. These experiment data suggest that there is a competition between the expansion forces due to electron-phonon interaction and in-plane phonon vibrations, and the contraction forces due to out-of-plane phonon vibrations.…”

Growth of composition-modulated Ag/Co wires on Pt(997)

“…In this scattering geometry, the He reflectivity depends on the overall terrace defect density; the TEAS oscillations have a period of 1 ML. egory of simplified N-body potentials has been applied with success to transition metals to explain properties that depend on the effective width of the d electronic density of states, determined by its second moment within the tight-binding scheme, [41][42][43][44][45][46][47] but not on its details. 37 These potentials are able to account for the cohesive properties of bulk solids, 43 the experimentally observed contraction of the first interlayer spacing occurring at surfaces of transition metals, 37,46 the energy barriers for diffusion, 45 and, to a lesser extent, the elastic constants 43 and the formation energy of a vacancy.…”