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High-pressure studies of MSb3 (M = Fe, Co) at quasi-hydrostatic conditions

We present a comparative study of the unfilled CoSb3 and FeSb3 skutterudites and report on their compressibility studied by high-pressure synchrotron X-ray diffraction. The equation of state for FeSb3 was received for the first time. The third order Birch- Murnaghan isothermal equations of state were fitted to the experimental data in the pressure ranges atm-34 GPa for CoSb3 and atm-14 GPa for FeSb3. Bulk moduli of 95(5) GPa and 86(4) GPa have been obtained for CoSb3 and FeSb3, respectively. The bulk modulus of FeSb3 is in a contrast by about 30% with literature value obtained indirectly. Anomaly was observed in the diffraction pattern of CoSb3 at the pressures 34.4-39.6 GPa which is most probably reasoned by structure transition.

preprint2016arXivOpen access

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