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| Title: | The valence state of Yb ion in YblnAu_2 compound at high pressure determined by x-ray diffraction and x-ray absorption near edge structure measurements |
| Authors: | Fuse, A.
Nakamoto, G.
Ishimatsu, N.
Kurisu, M. |
| Issue Date: | 2006-08-25 |
| Publisher: | American Institute of Physics |
| Magazine name: | Journal of Applied Physics |
| Volume: | 100 |
| Number: | 4 |
| Start page: | 43712-1 |
| End page: | 43712-4 |
| DOI: | 10.1063/1.2335388 |
| Abstract: | X-ray diffraction patterns and L_<III>-edge x-ray absorption near edge structure (XANES) spectra of YbInAu_2 and LuInAu_2 compounds have been measured at high pressure and room temperature using a diamond anvil cell and a synchrotron radiation at SPring-8. YbInAu_2 is more compressible at pressures lower than 4 GPa than above it; the evaluated bulk modulus by Birch-type equation of state is 54.7 GPa which is one-half of that of the LuInAu_2 (112.5 GPa). The mean valence v^^￣ of Yb ion in YbInAu_2 determined by the XANES measurement is an increasing function of pressure: 2.71(2) at normal pressure and 2.94(2) at 10 GPa. The rate of increase in v^^￣ with pressure is two times larger at pressures below 4 GPa than that above 4 GPa. However, the v^^￣ is described by a linear increasing function of the lattice compression: v^^￣=v^^￣_0+2.9|ΔV/V_0| where v^^￣_0 is 2.71. The extrapolation to the trivalent state gives the critical pressure of 13 GPa. |
| Rights: | Copyright 2006 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in A. Fuse, G. Nakamoto, N. Ishimatsu, M. Kurisu, Journal of Applied Physics, 100(4), 43712- (2006) and may be found at http://link.aip.org/link/?JAPIAU/100/043712/1 |
| URI: | http://hdl.handle.net/10119/4524 |
| Material Type: | publisher |
| Appears in Collections: | c10-1. 雑誌掲載論文 (Journal Articles)
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