palladiumhydrides
Palladium hydrides are binary compounds formed between palladium and hydrogen. When palladium metal is exposed to hydrogen gas, hydrogen atoms can diffuse into the palladium lattice, forming a solid solution or distinct hydride phases. The most common and well-studied palladium hydride is PdHₓ, where x represents the atomic ratio of hydrogen to palladium. This ratio can vary significantly depending on the hydrogen pressure and temperature. At low hydrogen concentrations, palladium forms a face-centered cubic (FCC) solid solution phase, often denoted as α-phase. As the hydrogen concentration increases, a second FCC phase, the β-phase, forms. These two phases can coexist over a range of compositions.
The formation of palladium hydrides is a reversible process. Hydrogen can be absorbed by palladium and subsequently