Nuclear-relaxed elastic and piezoelectric constants of materials : Computational aspects of two quantum-mechanical approaches

© 2016 Wiley Periodicals, Inc.

Détails bibliographiques
Publié dans:Journal of computational chemistry. - 1984. - 38(2017), 5 vom: 15. Feb., Seite 257-264
Auteur principal: Erba, Alessandro (Auteur)
Autres auteurs: Caglioti, Dominique, Zicovich-Wilson, Claudio Marcelo, Dovesi, Roberto
Format: Article en ligne
Langue:English
Publié: 2017
Accès à la collection:Journal of computational chemistry
Sujets:Journal Article elasticity piezoelectricity strain tensor
Description
Résumé:© 2016 Wiley Periodicals, Inc.
Two alternative approaches for the quantum-mechanical calculation of the nuclear-relaxation term of elastic and piezoelectric tensors of crystalline materials are illustrated and their computational aspects discussed: (i) a numerical approach based on the geometry optimization of atomic positions at strained lattice configurations and (ii) a quasi-analytical approach based on the evaluation of the force- and displacement-response internal-strain tensors as combined with the interatomic force-constant matrix. The two schemes are compared both as regards their computational accuracy and performance. The latter approach, not being affected by the many numerical parameters and procedures of a typical quasi-Newton geometry optimizer, constitutes a more reliable and robust mean to the evaluation of such properties, at a reduced computational cost for most crystalline systems. © 2016 Wiley Periodicals, Inc
Description:Date Completed 26.11.2018
Date Revised 26.11.2018
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1096-987X
DOI:10.1002/jcc.24687