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Abstract
X-ray diffraction patterns of FeAu and FePt have been measured at pressures up to ∼55 GPa with good signal-to-noise ratio and high resolution using synchrotron radiation. Rietveld analysis has been performed. The structure of FeAu is cubic in space group Fm3¯m with a lattice parameter a=3.9634±0.0012 Å.A third-order Birch–Murnaghan equation of state fit to the experimental data yields V
0=62.26±0.05 Å3, with a B
0 of 180.6±4.7 GPa and . The structure of FePt is tetragonal in space group P4/mmm with lattice parameters a=b=2.6748±0.0005 Å and c=3.7375±0.0008 Å.A third-order Birch–Murnaghan equation of state fit to the experimental data yields V
0=26.74±0.01 Å3, with a B
0 of 264.1±9.8 GPa and
.
Acknowledgements
Experiments at PLS were supported in part by MOST and POSTECH. One of us (Dr Y. Lee) thanks the support of the Korea Science & Engineering Foundation through the Nuclear R&D Program (Grant No. M2AM06-2008-03931). The work at Brookhaven National Laboratory is operated for the US Department of Energy by Brookhaven Science Associates Grant No. DE-Ac02-98CH10886. This work was also supported by ADD. The referee's suggestions and help in the improvement of the manuscript is also acknowledged.