Growth and chemical properties of layered, binary mixed oxides: NO on MgO-NiO and CaO-NiO

The growth mode of layered, binary mixed oxides consisting of NiO, MgO, and CaO has been studied using low-energy electron diffraction (LEED), ion sca ttering spectroscopy (ISS), and NO temperature-programmed desorption (NO-TP D). The NiO/MgO layered system shows greater long-range order relative to N iO/CaO. The superior wetting found for NiO/MgO compared to NiO/CaO is likel y due to the close lattice match of NiO/MgO, in contrast to NiO/CaO. The in fluence of MgO and CaO on NO adsorption on NiO has been studied using TPD a nd infrared reflection absorption spectroscopy (IRAS) and correlated with t he growth mode of the corresponding layered oxide system. A long-range, sub strate-mediated interaction has been found between NO and coadsorbed MgO (o r CaO) on the NiO(100)/Mo(100) surface.