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Quantitative analysis of spatially resolved valence electron energy-loss spectra shows strong physical property contrasts for Σ5 and near Σ13 grain boundaries in Fe-doped SrTiO3, resulting in London dispersion interaction energies of 14 to 50mJ/m2 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.
Physical Review Letters
©2004 American Physical Society
Klaus van Benthem, Guolong Tan, Linda K. DeNoyer, Roger H. French, and Manfred Rühle. Local Optical Properties, Electron Densities, and London Dispersion Energies of Atomically Structured Grain Boundaries. Phys. Rev. Lett. 93, 2004, 227201