title: Local optical properties, electron densities, and london dispersion energies of atomically structured grain boundaries.
abstract: Quantitative analysis of spatially resolved valence electron energy-loss spectra shows strong physical property contrasts for Sigma5 and near Sigma13 grain boundaries in Fe-doped SrTiO3, resulting in London dispersion interaction energies of 14 to 50 mJ/m(2) between the adjacent grains. The determination of local physical properties of grain boundary cores and the appreciable contribution of long-range London dispersion to interface energies provides new information on formation and control of interfaces in materials.
authors.affiliation: Max-Planck-Institut für Metallforschung, Heisenbergstrasse 3, 70569 Stuttgart, Germany.
authors.forename: Klaus
authors.initials: K
authors.lastname: van Benthem
authors.forename: Guolong
authors.initials: G
authors.lastname: Tan
authors.forename: Linda K
authors.initials: LK
authors.lastname: DeNoyer
authors.forename: Roger H
authors.initials: RH
authors.lastname: French
authors.forename: Manfred
authors.initials: M
authors.lastname: Rühle