A new high-pressure phase of FeSi with the CsCl structure has been synthesized by high-temperature reaction of Fe and Si mixtures at 24 GPa. Powder X-ray diffraction measurements yield a cubic unit cell of a = 2.7917(1) Angstrom for the CsCl-FeSi phase which has composition Fe0.2Si0.4x, by electron microprobe. The transition from epsilon-FeSi to the high-pressure phase occur's at 1950 +/- 50 K at 24 GPa and has a negative Clapeyron slope.
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Dobson et al. (2002) studied this question.
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