Anharmonicity of platinum under HP and HT

M. Okube; A. Yoshiasa; O. Ohtaka; Y. Katayama

doi:10.1080/0895795032000102423

Anharmonicity of platinum under HP and HT

M. Okube, A. Yoshiasa, O. Ohtaka, Y. Katayama

Materials Development Division

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

In order to examine the pressure effect on anharmonic thermal vibrations of Pt, Extended X-ray Absorption Fine Structure (EXAFS) spectra near Pt K-edge and L₃-edge were measured in the temperature range from 300 to 800 K under pressures up to 6 GPa, using large volume high-pressure devices and synchrotron radiation. We have investigated the anharmonic interatomic potentials by a cumulant expansion method. The values of EXAFS Debye-Waller factors, σ2 and σ3, become smaller with increase of pressure. The anharmonic effective pair potential V(u) = (1/2!)au² + (1/3!)bu ³ was evaluated and the potential coefficient a at 0.1 MPa and 6 GPa are 4.8 and 5.0eV/Å², respectively. The anharmonic potential parameter b decreases with increasing pressure.

Original language	English
Pages (from-to)	247-251
Number of pages	5
Journal	High Pressure Research
Volume	23
Issue number	3 SPEC. ISS.
DOIs	https://doi.org/10.1080/0895795032000102423
Publication status	Published - 2003 Sept

Keywords

Anharmonicity
EXAFS
High-pressure
High-temperature
Platinum

ASJC Scopus subject areas

Condensed Matter Physics

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10.1080/0895795032000102423

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title = "Anharmonicity of platinum under HP and HT",

abstract = "In order to examine the pressure effect on anharmonic thermal vibrations of Pt, Extended X-ray Absorption Fine Structure (EXAFS) spectra near Pt K-edge and L3-edge were measured in the temperature range from 300 to 800 K under pressures up to 6 GPa, using large volume high-pressure devices and synchrotron radiation. We have investigated the anharmonic interatomic potentials by a cumulant expansion method. The values of EXAFS Debye-Waller factors, σ2 and σ3, become smaller with increase of pressure. The anharmonic effective pair potential V(u) = (1/2!)au2 + (1/3!)bu 3 was evaluated and the potential coefficient a at 0.1 MPa and 6 GPa are 4.8 and 5.0eV/{\AA}2, respectively. The anharmonic potential parameter b decreases with increasing pressure.",

keywords = "Anharmonicity, EXAFS, High-pressure, High-temperature, Platinum",

author = "M. Okube and A. Yoshiasa and O. Ohtaka and Y. Katayama",

note = "Funding Information: Sincere thanks are due to Dr. Uruga, Dr. Tanida, Dr. Fukui and Dr. Murai for their experimental help. This research was performed under the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2000A0073-NX-np).",

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doi = "10.1080/0895795032000102423",

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AU - Okube, M.

AU - Yoshiasa, A.

AU - Ohtaka, O.

AU - Katayama, Y.

N1 - Funding Information: Sincere thanks are due to Dr. Uruga, Dr. Tanida, Dr. Fukui and Dr. Murai for their experimental help. This research was performed under the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2000A0073-NX-np).

PY - 2003/9

Y1 - 2003/9

N2 - In order to examine the pressure effect on anharmonic thermal vibrations of Pt, Extended X-ray Absorption Fine Structure (EXAFS) spectra near Pt K-edge and L3-edge were measured in the temperature range from 300 to 800 K under pressures up to 6 GPa, using large volume high-pressure devices and synchrotron radiation. We have investigated the anharmonic interatomic potentials by a cumulant expansion method. The values of EXAFS Debye-Waller factors, σ2 and σ3, become smaller with increase of pressure. The anharmonic effective pair potential V(u) = (1/2!)au2 + (1/3!)bu 3 was evaluated and the potential coefficient a at 0.1 MPa and 6 GPa are 4.8 and 5.0eV/Å2, respectively. The anharmonic potential parameter b decreases with increasing pressure.

AB - In order to examine the pressure effect on anharmonic thermal vibrations of Pt, Extended X-ray Absorption Fine Structure (EXAFS) spectra near Pt K-edge and L3-edge were measured in the temperature range from 300 to 800 K under pressures up to 6 GPa, using large volume high-pressure devices and synchrotron radiation. We have investigated the anharmonic interatomic potentials by a cumulant expansion method. The values of EXAFS Debye-Waller factors, σ2 and σ3, become smaller with increase of pressure. The anharmonic effective pair potential V(u) = (1/2!)au2 + (1/3!)bu 3 was evaluated and the potential coefficient a at 0.1 MPa and 6 GPa are 4.8 and 5.0eV/Å2, respectively. The anharmonic potential parameter b decreases with increasing pressure.

KW - Anharmonicity

KW - EXAFS

KW - High-pressure

KW - High-temperature

KW - Platinum

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JO - High Pressure Research

JF - High Pressure Research

IS - 3 SPEC. ISS.

ER -

Anharmonicity of platinum under HP and HT

Abstract

Keywords

ASJC Scopus subject areas

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