Which structural change results from dissolving hydrogen gas in palladium crystal lattice at high concentrations?

💡 Explanation

When hydrogen dissolves in palladium at high concentrations, it occupies interstitial sites in the lattice, causing lattice expansion and increased stress, which lowers fracture toughness via hydrogen embrittlement. Therefore, lattice expansion and embrittlement occur, rather than increased ductility or precipitation, which require different alloying behaviors.

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