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Molecular dynamics ...
Molecular dynamics simulations of an Al2O3(0001 +/-, 0-10(II))/CeO2 (011 +/-,01-1(II)) interface system
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Baudin, M. (författare)
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Wojcik, M. (författare)
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- Hermansson, Kersti (författare)
- KTH,Bioteknologi
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(creator_code:org_t)
- 2001
- 2001
- Engelska.
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Ingår i: Thin Solid Films. - 0040-6090 .- 1879-2731. ; 401:02-jan, s. 159-164
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Constant stress, constant temperature (10 K, 300 K) molecular dynamics simulations were carried out with shell-model potentials for an infinite composite ceria-alumina slab with two free surfaces [alpha -Al2O3 (0001) and CeO2(011) and their opposite counterparts]. The interface introduces considerable structural and dynamical changes, both at the slab surfaces and in the center of the slab. Structurally, both oxide surfaces become effectively oxygen-terminated and the surface structures become disordered close to the interface. Dynamically, in the region near the 'alumina surface/ceria surface/alumina-ceria interface' 3-phase junction the ionic motion is considerably enhanced. Thus, in the interface region, the ionic mean-square displacements increase 2-3 times compared to the pure slabs. Moreover, the ions at the interface participate in a new kind of motion, not present in the pure oxide slabs: large occasional, but frequently reoccurring, back-and-forth ionic motions take place with square-amplitudes as large as similar to0.70 Angstrom (2).
Nyckelord
- three-way catalysts
- molecular dynamic simulations
- aluminium oxide
- ceria
- surface dynamics
- interface structure
- cerium dioxide
- principles calculations
- ceramic interfaces
- alpha-alumina
- 0001 surface
- alpha-al2o3
- adsorption
- morphology
- stability
- crystal
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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