Lattice dynamics of fcc crystals under hydrostatic loading
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F12%3APU100807" target="_blank" >RIV/00216305:26210/12:PU100807 - isvavai.cz</a>
Výsledek na webu
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DOI - Digital Object Identifier
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Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Lattice dynamics of fcc crystals under hydrostatic loading
Popis výsledku v původním jazyce
Lattice dynamics and stability of four fcc crystals (Al, Ir, Pt, and Au) under isotropic (hydrostatic) tensile loading is studied from first principles using the linear response method and the harmonic approximation. A relevant analysis of elastic stability conditions is also performed and the results obtained by means of both approaches are compared. The results reveal that, contrary to former expectations, strengths of all the studied crystals are limited by instabilities related to soft phonons withfinite or vanishing wave vectors. The critical strains associated with such instabilities are remarkably lower than those related to the volumetric instability. On the other hand, the corresponding reduction of the tensile strength is by 20 % at the most.
Název v anglickém jazyce
Lattice dynamics of fcc crystals under hydrostatic loading
Popis výsledku anglicky
Lattice dynamics and stability of four fcc crystals (Al, Ir, Pt, and Au) under isotropic (hydrostatic) tensile loading is studied from first principles using the linear response method and the harmonic approximation. A relevant analysis of elastic stability conditions is also performed and the results obtained by means of both approaches are compared. The results reveal that, contrary to former expectations, strengths of all the studied crystals are limited by instabilities related to soft phonons withfinite or vanishing wave vectors. The critical strains associated with such instabilities are remarkably lower than those related to the volumetric instability. On the other hand, the corresponding reduction of the tensile strength is by 20 % at the most.
Klasifikace
Druh
O - Ostatní výsledky
CEP obor
BM - Fyzika pevných látek a magnetismus
OECD FORD obor
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Návaznosti výsledku
Projekt
Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2012
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů