Alternatively small atoms in some crystals may occupy interstitial sites in energetically favorable configurations , such as hydrogen in palladium .
In interstitial defects three or more atoms may share one lattice site , thereby increasing its total energy .
Small atoms in some crystals may occupy interstitial sites in energetically favorable configurations , such as hydrogen in palladium .
In interstitial defects three or more atoms may share one lattice site , thereby increasing its total energy .