‘‘γ-α’’ phase transition of monolayer Ce on W(110)

Abstract

As Ce is adsorbed on a W(110) substrate at 300 K an epitaxial layer develops at a coverage of 0.5 monolayer. LEED patterns indicate a hexagonal pattern consistent with Ce(111). As Ce is added, the lattice parameter shrinks continuously from 9% larger than that for \ensuremath{\gamma}-Ce to 3% smaller than that for \ensuremath{\alpha}-Ce. 4f photoelectron spectra reveal two peaks similar to those of \ensuremath{\gamma}-Ce, changing relative intensity with increasing coverage to resemble those of \ensuremath{\alpha}-Ce.