Before revision: Interstitial solid solution rules For interstitial solid solutions, the Hume-Rothery Rules are: Solute atoms should have a smaller radius than 59%DIF < of the radius of solvent atoms.
After revision: Interstitial solid solution rules For interstitial solid solutions, the Hume-Rothery Rules are: Solute atoms should have a smaller diameter than 59%DIF < of the radius of solvent atoms.