Electron density and work function dependence of the enthalpy of formation of metal oxides

Abstract

The enthalpies of formation of metal oxides, calculated per oxygen atom, show a dependence on two terms, the work function and the electron density differences between the metal and the oxygen. For the transition metals the first term dominates since the second one seems negligibly small. For non‐transition metals the electron density term seems to affect greatly the corresponding enthalpy of formation.

Pulsed Laser Deposition of PdCuAu Alloy Membranes for Hydrogen Absorption Study

“…Similar results were observed in PdCuAu prepared by other deposition techniques and other PdCu binary and ternary alloys. − Moreover, on high-resolution XPS spectra (Figure ), characteristic copper oxide peaks are observed. Since no heat treatment was performed, Cu presence at the surface might be related to its higher affinity for oxygen . This does not present an issue for further hydrogen solubility measurements, however, as the bulk region is much thicker (typically 140 nm) than the surface region (smaller than 5 nm).…”

“…Since no heat treatment was performed, Cu presence at the surface might be related to its higher affinity for oxygen. 44 This does not present an issue for further hydrogen solubility measurements, however, as the bulk region is much thicker (typically 140 nm) than the surface region (smaller than 5 nm). Moreover, as mentioned earlier, hydrogen solubility measure-ments will be performed by focusing on a distinct XRD peak of the alloy (and not on the surface copper oxide phase).…”