Anharmonicity of platinum under HP and HT

Okube, Maki*; Yoshiasa, Akira*; Otaka, Osamu*; Katayama, Yoshinori

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 L $_{3}$ -edge were measured in the temperature range from 300 to 800K under pressures up to 6vGPa, 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, 2 and 3, become smaller with increase of pressure. The anharmonic effective pair potential $V(u) = (1/2!)au^{2} + (1/3!)bu^{3}$ was evaluated and the potential coefficient a at 0.1MPa and 6GPa are 4.8 and 5.0eV/ $AA $^{2}$$ , respectively. The anharmonic potential parameter decreases with increasing pressure.

Language	:	English
Journal	:	High Pressure Research
Volume	:	23
Number	:	3
Pages	:	p.247 - 251
Publication Year/Month	:	2003/09
Meeting title	:	40th European High-Pressure Research Group Meeting
Held date	:	2002/09
Location (city)	:	Edinburgh
Location (country)	:	U.K.
Patent information	:
PDF	:
Paper URL	:	https://doi.org/10.1080/0895795032000102423
DOI for research data	:
Keywords	:	白金; 非調和性; 高圧; 高温; EXAFS; X線吸収; 対ポテンシャル; 熱振動; 放射光; 圧力効果
Research Facility	:	SPring-8(大型放射光施設)
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:

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Registration No. : B20040107
JAEA Abstracts No. : 320803
Paper Submission No. : 21217

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