Lithium adsorption on the SrTiO₃(100) surface

Abstract

In this paper we study the kinetics of Li adsorption on the SrTiO3(100) (STO(100)) surface at room temperature (RT). The study took place in an ultra-high vacuum (UHV) by low-energy electron diffraction (LEED), Auger electron spectroscopy (AES), electron energy-loss spectroscopy (EELS), temperature-programmed desorption (TPD) and work function (WF) measurements. At low Li coverage (θ<0.5 ML), Li adsorbs as isolated atoms, whereas at higher coverage it intermixes with the oxygen of the substrate and/or it intercalates into the substrate. The sticking coefficient of Li on STO(100) is constant. The lithium remains in a non-metallic state on the surface. After heating at 1100 K, part of the Li remains on the surface.

Crystal Orientation-Dependent Reactivity of Oxide Surfaces in Contact with Lithium Metal

“…The incorporation of Li into the subsurface of the reconstructed TiO x layer is consistent with the well-known insertion of Li into multiple TiO 2 polymorphs . Further Li insertion becomes much less favorable with two or four Li on (3 × 1)-(110), as summarized in Table S1, which is also consistent with the surface-limited nature of the reaction observed from XPS and with the fact that Li does not intercalate into bulk STO . Incorporation of Li below the top TiO x layer results in a lower stability of this layer, since its removal after Li insertion results in a much more stable termination than that in the absence of inserted Li.…”

“…34 Further Li insertion becomes much less favorable with two or four Li on (3 × 1)-( 110), as summarized in Table S1, which is also consistent with the surface-limited nature of the reaction observed from XPS and with the fact that Li does not intercalate into bulk STO. 35 Incorporation of Li below the top TiO x layer results in a lower stability of this layer, since its removal after Li insertion results in a much more stable termination than that in the absence of inserted Li. This may explain the observed morphological instability of the STO(110) surface, with washing in H 2 O resulting in removal of the TiO x along with the underlying LiO x .…”

Na adsorption on SrTiO3 (0 0 1) surface and its interaction with water: A DFT calculation

“…However, to our knowledge, alkali metals adsorption on SrTiO 3 surface does not have many investigations. Mori and Kamaratos studied Li [27] and K [28] adsorption on SrTiO 3 (0 0 1) surface. They found a strong adsorption of Li and K on SrTiO 3 (0 0 1) surface.…”