Experimental determination of the {111}/{001} surface energy ratio for Pd crystals
Peiyu Chen, Yakun Gao, Martin R. Castell
Abstract
Pd crystals grown in ultrahigh vacuum (UHV) on nanostructured SrTiO3(001) and anatase TiO2(001) thin film substrates were studied using scanning tunneling microscopy. The crystals have the equilibrium shape of a truncated octahedron with a {111} top facet, {111} and {001} side facets, and a {111} interface. A consistent crystal shape is reached only after annealing the samples in UHV at 450 °C or above. By measuring the top facet dimensions of the equilibrium crystals, we determine the ratio of the surface energies for Pd to be γ111/γ001 = 0.77 ± 0.02.
Topics & Concepts
Scanning tunneling microscopeFacet (psychology)Annealing (glass)Materials scienceOctahedronCrystallographySurface reconstructionFacetingCrystal (programming language)Surface energyAnataseEpitaxyCondensed matter physicsSurface (topology)Crystal structureNanotechnologyChemistryMetallurgyCatalysisMathematicsBig Five personality traitsProgramming languageComputer scienceSocial psychologyComposite materialPhotocatalysisPhysicsBiochemistryGeometryPersonalityLayer (electronics)PsychologySurface and Thin Film PhenomenaSurface Chemistry and CatalysisAdvanced Chemical Physics Studies