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 language | English (US) |
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Pages (from-to) | 116-122 |
Number of pages | 7 |
Journal | Thin Solid Films |
Volume | 437 |
Issue number | 1-2 |
DOIs | |
State | Published - 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