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Gavriliuk, A. G.; Struzhkin, V. V.; Aksenov, S. N.; Ivanova, A. G.; Mironovich, A. A.; Troyan, I. A.; Lyubutin, I. S.
JETP letters, 12/2022, Volume: 116, Issue: 11Journal Article
Iron polyhydrides have been synthesized at pressures of 77–157 GPa and temperatures up to 2000 K by the laser heating of an iron–borazane (ammonia borane NH 3 BH 3 ) sample in diamond anvil cells. X-ray spectra of the synthesized products indicate the formation of several FeH x phases, in which (in two cells) reflections of FeH iron hydride with the tetragonal phase are reliably detected. The magnetic and electronic properties of FeH x compounds have been studied by nuclear forward scattering spectroscopy on Fe-57 nuclei at high pressures in the temperature range of 4–300 K in external magnetic fields up to 5 T. The nuclear forward scattering data indicate at least seven FeH x compounds with very different electronic and magnetic properties. The Néel temperature T N determined for the FeH 2 phase at a pressure of 82 GPa is about 174 K. One of the striking results is the observation of the FeH x phase remaining magnetically ordered at a pressure of 128 GPa in the entire temperature range of 4–300 K. Such a high pressure is characteristic of the boundary between the lower mantle and the outer core of the Earth. The existence of a magnetic phase of an iron compound at such a record high pressure is unique and has not yet been observed.
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