Comparison of the surface chemical reactivity of hafnium diboride and hafnium

The surface chemistry of the Hf terminated hafnium diboride surface is comp ared with the surface chemistry of I-If metal. The HfB2 surface was prepare d by growing an epitaxial film of HfB2 on top of a Hf(0001) single crystal substrate. Previous experiments demonstrated that the epitaxial film has th e same surface properties as a HfB2(0001) single crystal. The reactivity of the Hf and HfB2 surfaces toward carbon monoxide, diborane, and 1,2-dicarba -closo-dodecaborane were studied with X-ray photoelectron spectroscopy and reflection absorption IR spectroscopy. It was found that the two surfaces d isplay distinctly different surface chemical properties. (C) 1999 Elsevier Science S.A. All rights reserved.