The thermal expansion of palladium-silver alloys at low temperatures

Abstract

Interferometric measurements of the thermal expansion of palladium, silver and five alloys of these metals are reported in the temperature range 30 to 270 °K. The experimental uncertainties rise from approximately 1% at 270 °K to 15% at 30 °K. The variation of thermal expansion with concentration is non-linear and the form of the variation is not substantially affected by temperature in the range covered. A degree of correlation has been found with related thermodynamic properties of the alloys, and the need has been established for a rigorous theory of the thermal expansion of binary alloys on an atomic scale.

X-ray diffraction study of the structure and thermal parameters of the ternary Au–Ag–Pd alloys

“…(a(T ) − a 0 ) a 0 = (1.47 u 2 (T )) v (8) The plot of MLTE in Fig. 3 demonstrates this relationship for all the investigated alloys.…”

“…1 The scientific understanding and technological importance of thermal expansion of the alloys has lead to the measurement of this property for various materials [3], e.g. the binary Au-Ag [4], Au-Pd [4][5][6][7] and Ag-Pd [4,[8][9] alloys, but the experimental data on the ternary Au-Ag-Pd alloys is rather limited [3][4].…”

First-principles calculations and tight-binding molecular dynamics simulations of the palladium-hydrogen system

“…For the theoretical and experimental values of the bulk modulus of 225.69 and 183.32 GPa, we find ␣ L = 1.7ϫ 10 −5 K −1 and 2 ϫ 10 −5 K −1 which are approximately two times larger than the thermalexpansion coefficient of pure palladium. 25…”

Analysis of hydrogen diffusion coefficient during hydrogen permeation through niobium and its alloys

“…6 shows the correlation between the normalized hydrogen flux, J·d, and the difference of hydrogen concentration, C, between the inlet and outlet sides of the membrane. Here, the lattice expansion due to the thermal heating [18,19] and the hydrogen uptake into metals [19,20] are taken into account in order to estimate the hydrogen molar concentration, mol H/m 3 , instead of the atomic ratio H/M.…”