X-ray diffraction patterns of FeAu and FePt have been measured at pressures up to ̃55GPa 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 Fm3m with a lattice parameter a=3.9634±0. 0012.Å third-order Birch-Murnaghan equation of state fit to the experimental data yields V0=62.26±0.05 Å3, with a B 0 of 180.6±4.7GPa and B'0 =3.5±0.3. The structure of FePt is tetragonal in space group P4/mmm with lattice parameters a=b=2.6748±0.0005 Åand c=3.7375±0.0008.Å third-order Birch-Murnaghan equation of state fit to the experimental data yields V 0=26.74±0.01Å3, with a B0 of 264.1±9.8GPa and B'0= 5.0 ± 0.7.
Bibliographical noteFunding Information:
Experiments at PLS were supported in part by MOST and POSTECH. One of us (DrY. 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 byADD. The referee’s suggestions and help in the improvement of the manuscript is also acknowledged.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics