ANHARMONICITY OF PLATINUM UNDER HP AND HT

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 800 K under pressures up to 6GPa, using large volume high-pressure devices and sync...

Full description

Saved in:
Bibliographic Details
Published in:High pressure research 2003-09, Vol.23 (3), p.247-251
Main Authors: Okube, M., Yoshiasa, A., Ohtaka, O., Katayama, Y.
Format: Article
Language:English
Subjects:
Anharmonicity
EXAFS
High-pressure
High-temperature
Platinum
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 800 K under pressures up to 6GPa, 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!)au 2 +(1/3!)bu 3 was evaluated and the potential coefficient a at 0.1 MPa and 6GPa are 4.8 and 5.0eV/Å 2 , respectively. The anharmonic potential parameter b decreases with increasing pressure.
ISSN:0895-7959
1477-2299
DOI:10.1080/0895795032000102423