Investigation of the structure of β-tantalum

Aiqin Jiang, Anto Yohannan, Neme O. Nnolim, Trevor A. Tyson, Lisa Axe, Sabrina L. Lee, Paul Cote

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

The local structure of β-tantalum was investigated by comparing experimental extended X-ray absorption fine structure (EXAFS) measurements with calculated spectra of proposed models. Four possible structure candidates were examined: a β-Uranium based structure, a distorted A15 structure, a bcc-Ta based superlattice structure with N interstitials and a simple hcp structure. The local structural measurements were found to be consistent with the β-Uranium based model containing 30 atoms per unit cell and having the space group P42/mnm. The thermal effect analysis on X-ray diffraction and EXAFS spectra, which reveals that β-Ta is highly disordered, agrees with the low symmetry and anisotropic system of the β-U model.

Original languageEnglish (US)
Pages (from-to)116-122
Number of pages7
JournalThin Solid Films
Volume437
Issue number1-2
DOIs
StatePublished - Aug 1 2003

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Keywords

  • EXAFS
  • Metastable phases
  • Tantalum
  • XRD

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