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Statements

Subject Item
n2:RIV%2F00216305%3A26210%2F12%3APU100807%21RIV13-GA0-26210___
rdf:type
n8:Vysledek skos:Concept
dcterms:description
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 with finite 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. 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 with finite 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.
dcterms:title
Lattice dynamics of fcc crystals under hydrostatic loading Lattice dynamics of fcc crystals under hydrostatic loading
skos:prefLabel
Lattice dynamics of fcc crystals under hydrostatic loading Lattice dynamics of fcc crystals under hydrostatic loading
skos:notation
RIV/00216305:26210/12:PU100807!RIV13-GA0-26210___
n8:predkladatel
n11:orjk%3A26210
n3:aktivita
n18:P
n3:aktivity
P(ED1.1.00/02.0068), P(GD106/09/H035)
n3:dodaniDat
n10:2013
n3:domaciTvurceVysledku
n15:5612543 n15:9413030 n15:8126887
n3:druhVysledku
n17:O
n3:duvernostUdaju
n13:S
n3:entitaPredkladatele
n12:predkladatel
n3:idSjednocenehoVysledku
146546
n3:idVysledku
RIV/00216305:26210/12:PU100807
n3:jazykVysledku
n7:eng
n3:klicovaSlova
phonon instability, theoretical strength, isotropic loading
n3:klicoveSlovo
n4:phonon%20instability n4:isotropic%20loading n4:theoretical%20strength
n3:kontrolniKodProRIV
[B5EA8C047B86]
n3:obor
n14:BM
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
3
n3:projekt
n5:GD106%2F09%2FH035 n5:ED1.1.00%2F02.0068
n3:rokUplatneniVysledku
n10:2012
n3:tvurceVysledku
Pokluda, Jaroslav Řehák, Petr Černý, Miroslav
n16:organizacniJednotka
26210