Investigation of the structure of β-tantalum

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

doi:10.1016/S0040-6090(03)00702-8

Investigation of the structure of β-tantalum

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

New Jersey Institute of Technology

Research output: Contribution to journal › Article › peer-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 language	American English
Pages (from-to)	116-122
Number of pages	7
Journal	Thin Solid Films
Volume	437
Issue number	1-2
DOIs	https://doi.org/10.1016/S0040-6090(03)00702-8
State	Published - Aug 1 2003

ASJC Scopus subject areas

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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10.1016/S0040-6090(03)00702-8

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title = "Investigation of the structure of β-tantalum",

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.",

keywords = "EXAFS, Metastable phases, Tantalum, XRD",

author = "Aiqin Jiang and Anto Yohannan and Nnolim, {Neme O.} and Tyson, {Trevor A.} and Lisa Axe and Lee, {Sabrina L.} and Paul Cote",

note = "Funding Information: We thank the US Army Sustainable Green Manufacturing Program for the financial support. Experimental data were collected at the National Synchrotron Light Source of Brookhaven National Laboratory funded by US Department of Energy (DOE).",

year = "2003",

month = aug,

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doi = "10.1016/S0040-6090(03)00702-8",

language = "American English",

volume = "437",

pages = "116--122",

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T1 - Investigation of the structure of β-tantalum

AU - Jiang, Aiqin

AU - Yohannan, Anto

AU - Nnolim, Neme O.

AU - Tyson, Trevor A.

AU - Axe, Lisa

AU - Lee, Sabrina L.

AU - Cote, Paul

N1 - Funding Information: We thank the US Army Sustainable Green Manufacturing Program for the financial support. Experimental data were collected at the National Synchrotron Light Source of Brookhaven National Laboratory funded by US Department of Energy (DOE).

PY - 2003/8/1

Y1 - 2003/8/1

N2 - 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.

AB - 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.

KW - EXAFS

KW - Metastable phases

KW - Tantalum

KW - XRD

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U2 - 10.1016/S0040-6090(03)00702-8

DO - 10.1016/S0040-6090(03)00702-8

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SN - 0040-6090

VL - 437

SP - 116

EP - 122

JO - Thin Solid Films

JF - Thin Solid Films

IS - 1-2

ER -

Investigation of the structure of β-tantalum

Abstract

ASJC Scopus subject areas

Keywords

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