2006
DOI: 10.1103/physrevb.74.205110
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Graded interface models for more accurate determination of van der Waals–London dispersion interactions across grain boundaries

Abstract: Attractive van der Waals-London dispersion interactions between two half crystals arise from local physical property gradients within the interface layer separating the crystals. Hamaker coefficients and London dispersion energies were quantitatively determined for Σ5 and near-Σ13 grain boundaries in SrTiO 3 by analysis of spatially resolved valence electron energy-loss spectroscopy (VEELS) data. From the experimental data, local complex dielectric functions were determined, from which optical properties can b… Show more

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Cited by 21 publications
(21 citation statements)
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“…Note that for a small collection semi-angle β = 36 mrad, the intensity of the Sr and TiO signatures present similar magnitude in qualitative agreement with calculations done by Dwyer [16] on a CO molecule. spectral range corresponding to the interband and plasmon energy losses respectively in good agreement with the expected delocalisation limits for electronic excitations [7,17].…”
Section: Resultssupporting
confidence: 80%
See 1 more Smart Citation
“…Note that for a small collection semi-angle β = 36 mrad, the intensity of the Sr and TiO signatures present similar magnitude in qualitative agreement with calculations done by Dwyer [16] on a CO molecule. spectral range corresponding to the interband and plasmon energy losses respectively in good agreement with the expected delocalisation limits for electronic excitations [7,17].…”
Section: Resultssupporting
confidence: 80%
“…Typical experiments focus on surface plasmons with modes as low as 0.17 eV being experimentally accesible 10 [6]. It is also possible to probe changes in the band-gap of semiconductors at the atomic scale in semiconductor devices [7,8]. Improving the energy resolution further seems attractive in order to study phonon lattice vibrations which typically occur between a few meV and 15 1 eV at large scattering angles (10-1000 mrad).…”
Section: Introductionmentioning
confidence: 99%
“…Small variations in the London dispersion spectra can have large manifestations in the potential, 73 and we have not included any ionic effects, 74 nor addressed the non-pairwise additivity of vdW potentials in multilayered systems at large separations. 75 We have specifically limited our analysis to the near-field to mitigate such effects.…”
Section: Discussionmentioning
confidence: 99%
“…Beyond simple three-layer configurations, we have also developed methods for more complex Hamaker coefficient calculations that can be used to represent complex multilayer or graded interfaces. [7,8,69] These methods are all included in the Gecko Hamaker program. [70] Polystyrene Interlayer Polystyrene …”
Section: Van Der Waals-london Dispersion Interactionsmentioning
confidence: 99%
“…The Hamaker constant is large for a vacuum interlayer, and zero if the interlayer material 2 is identical to the two other materials 1 and 3. The intimate relationship between the electronic structure and optical properties, [6] and this universal vdW-Ld interaction has attracted increased interest in the fields of materials science, [7][8][9] physics, chemistry, and biology. [10] A general characteristic is the role of vdW-Ld in wetting [11] and adhesion, and thus, a detailed knowledge of the optical properties and dispersion interaction in PS is of increased interest.…”
Section: Introductionmentioning
confidence: 99%