AB INITIO STUDY OF SILVER NANOPARTICLES, GRAIN BOUNDARIES AND THEIR QUADRUPLE JUNCTIONS

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Publikace nespadá pod Ústav výpočetní techniky, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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POLSTEROVÁ Svatava VŠIANSKÁ Monika FRIÁK Martin PIZÚROVÁ Naděžda SOKOVNIN Sergey ŠOB Mojmír

Rok publikování 2021
Druh Článek ve sborníku
Konference 13th International Conference on Nanomaterials - Research and Application, NANOCON 2021
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://doi.org/10.37904/nanocon.2021.4365
Doi http://dx.doi.org/10.37904/nanocon.2021.4365
Klíčová slova Nanoparticles; silver; grain boundaries; junctions; quantum-mechanical calculations; elasticity
Popis Motivated by our experimental research related to silver nanoparticles with various morphologies, we have employed quantum-mechanical calculations to provide our experiments with theoretical insight. We have computed properties of a 181-atom decahedral silver nanoparticle and two types of internal extended defects, ??5(210) grain boundaries (GBs) and quadruple junctions (QJs) of these GBs. We have employed a supercell approach with periodic boundary conditions. Regarding the thermodynamic stability of the decahedral nanoparticle, its energy is higher than that of a defect-free face-centered cubic (fcc) Ag by 0.34 eV/atom. As far as the ??5(210) GB is concerned, its energy amounts to 0.7 J/m2 and we predict that the studied GBs would locally expand the volume of the lattice. Importantly, the system with GBs is found rather close to the limit of mechanical stability. In particular, the computed value of the shear-related elastic constant C66 is as low as 9.4 GPa with the zero/negative value representing a mechanically unstable system. We thus predict that the ??5(210) GBs may be prone to failure due to specific shearing deformation modes. The studied GBs have also the value of Poisson’s ratio for some loading directions close to zero. Next, we compare our results related solely to ??5(210) GBs with those of a system where multiple intersecting ??5(210) GBs form a network of quadruple junctions. The value of the critical elastic constant C66 is higher in this case, 13 GPa, and the mechanical stability is, therefore, better in the system with QJs.
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