Publication detail

Elastic stability of magnetic crystals under isotropic compression and tension

ČERNÝ, M.

Czech title

Elastická stabilita magnetických krystalů při isotropním tlaku a tahu

English title

Elastic stability of magnetic crystals under isotropic compression and tension

Type

journal article - other

Language

en

Original abstract

Mechanical stability of Fe, Ni and Cr in their ground-state cubic structures has been tested under isotropic compressive and tensile loading using an analysis based on elastic moduli of the crystal system. This analysis has also been used to compute the theoretical strengths of the studied elements. Elasticity has been studied using small distortions from several reference cubic states and corresponding changes of crystal energy. The total energy has been computed by means of ab initio code that uses plane wave basis set. The exchange and correlation contribution to the total energy has been treated by means of generalized gradient approximation. Magnetic ordering has been taken into account via collinear spin polarization. No shear instability has been found in the region of tensile stresses up to the points of inflection on energy volume dependencies of studied systems.

Czech abstract

Mechanická stabilita Fe, Ni a Cr v jejich základních kubických strukturách byla testována za isotropního tlakového a tahového zatížení s využitím analýzy založené na modulech pružnosti krystalu. Tato analýza byla rovněž užita k vypočtení teoretické pevnosti studovaných prvků. Pružnost byla studována pomocí malých výchylek z několika referenčních kubických stavů a odpovídajících změn energie krystalu. Celková energie byla počítána pomocí ab initio kódu který pužívá soubor rovinných vln. Výměnný a korelační příspěvek k celkové energii byl zpracován pomocí aproximace zobecněného gradientu. Magnetické uspořádání bylo vzato v úvahu prostřednictvím kolineární spinové polarizace. Žádná smyková nestabilita nebyla nalezena v celém rozsahu tahových napětí až po inflexní body na závislostech energie na objemu studovaných systémů.

English abstract

Mechanical stability of Fe, Ni and Cr in their ground-state cubic structures has been tested under isotropic compressive and tensile loading using an analysis based on elastic moduli of the crystal system. This analysis has also been used to compute the theoretical strengths of the studied elements. Elasticity has been studied using small distortions from several reference cubic states and corresponding changes of crystal energy. The total energy has been computed by means of ab initio code that uses plane wave basis set. The exchange and correlation contribution to the total energy has been treated by means of generalized gradient approximation. Magnetic ordering has been taken into account via collinear spin polarization. No shear instability has been found in the region of tensile stresses up to the points of inflection on energy volume dependencies of studied systems.

Keywords in English

Magnetism; Elastic moduli; Stability analysis; Isotropic loading

RIV year

2006

Released

01.01.2006

Publisher

Elsevier

ISSN

0921-5093

Journal

Materials Science and Engineering A

Volume

462

Number

1

Pages from–to

432–435

Pages count

4

BIBTEX


@article{BUT43385,
  author="Miroslav {Černý},
  title="Elastic stability of magnetic crystals under isotropic compression and tension",
  journal="Materials Science and Engineering A",
  year="2006",
  volume="462",
  number="1",
  month="January",
  pages="432--435",
  publisher="Elsevier",
  issn="0921-5093"
}