The dislocations contrast factors of cubic crystals in the Zener constant range between zero and unity

I. C. Dragomir, T. Ungár

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Diffraction peak profiles broaden due to the smallness of crystallites and the presence of lattice defects. Strain broadening of powders of polycrystalline materials is often anisotropic in terms of the hkl indices. This kind of strain anisotropy has been shown to be well interpreted assuming dislocations as one of the major sources of lattice distortions. The knowledge of the dislocation contrast factors are inevitable for this interoperation. In a previous work the theoretical contrast factors were evaluated for cubic crystals for elastic constants in the Zener constant range 0.5≤Az≤8. A large number of ionic crystals and many refractory metals have elastic anisotropy, Az, well below 0.5. In the present work the contrast factors for this lower anisotropy-constant range are investigated. The calculations and the corresponding peak profile analysis are tested on ball milled PbS and Nb and nanocrystalline CEO2.

Original languageEnglish
Pages (from-to)104-111
Number of pages8
JournalPowder Diffraction
Volume17
Issue number2
DOIs
Publication statusPublished - Jun 2002

Fingerprint

Dislocations (crystals)
unity
Anisotropy
Crystals
crystals
refractory metals
Refractory metals
elastic anisotropy
Polycrystalline materials
anisotropy
Crystal defects
ionic crystals
Elastic constants
profiles
Crystallites
Powders
crystallites
balls
elastic properties
Diffraction

Keywords

  • Contrast factors
  • Dislocations
  • Elastic anisotropy
  • Microstructure
  • Powder diffraction

ASJC Scopus subject areas

  • Materials Science (miscellaneous)

Cite this

The dislocations contrast factors of cubic crystals in the Zener constant range between zero and unity. / Dragomir, I. C.; Ungár, T.

In: Powder Diffraction, Vol. 17, No. 2, 06.2002, p. 104-111.

Research output: Contribution to journalArticle

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