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Atomistic structure of oxide nanoparticles supported on an oxide substrate

Sayle, D.C., Doig, J.A., Maicaneanu, S.A., Watson, G.W. (2002) Atomistic structure of oxide nanoparticles supported on an oxide substrate. Physical Review B: Condensed Matter and Materials Physics, 65 (24). p. 245414. ISSN 0163-1829. (doi:10.1103/PhysRevB.65.245414) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:46814)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1103/PhysRevB.65.245414

Abstract

The atomistic structures of SrO (15×15×2.2nm), CaO (14×14×2nm), and MgO (12×12×2nm) nanoparticles, supported on BaO(001) and synthesized using a simulated amorphization and recrystallization strategy, are presented. The SrO and CaO exhibit cubic “slab” morphologies in contrast to the MgO nanoparticle, which comprises various misaligned interconnecting crystallites. The lattice misfit was found to have a profound influence on the structure of the nanoparticles. The SrO nanoparticle (-7% misfit) was found to lie coherent with respect to the substrate across the entire area covered by the SrO. Conversely, only small regions of the CaO were found to be coherent with the BaO substrate (-15% misfit), with screw-edge dislocations located at regions where the ions became misaligned. The MgO nanoparticle (-31% misfit) exhibited no regions of coherence with respect to the underlying BaO substrate. Defects (vacancies and substitutionals) and defect clusters including voids were also identified for each system and act to help reduce locally the lattice misfit thereby enhancing the stability. Specifically, the results indicate that as the lattice misfit associated with the system increases, so the interfacial layer of the substrate becomes more defective. Arguments, based on the results of the study, are presented, which suggest that the area of the nanoparticle in contact with the substrate is linked with the critical thickness to dislocation evolution for a particular system. That the limitations of periodic boundary conditions can be eliminated when simulating nanoparticles compared with thin films, which cover completely the substrate material, is discussed.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.65.245414
Uncontrolled keywords: article, atom, calculation, crystallization, film, mathematical analysis, morphology, nanoparticle, parameter, reaction analysis, simulation, structure analysis, synthesis, thickness
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Dean Sayle
Date Deposited: 20 Mar 2015 16:06 UTC
Last Modified: 23 Jan 2020 04:09 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46814 (The current URI for this page, for reference purposes)
Sayle, D.C.: https://orcid.org/0000-0001-7227-9010
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