We report a Mossbauer spectroscopic study of cementite (Fe3C) in a diamond anvil cell up to 88 GPa. The hyperfine parameters reveal a two-stage loss of magnetism in Fe3C: a ferro-to-paramagnetic transition around 8-10 GPa and a spin transition at about 22 GPa. Full structural refinement based on single-crystal x-ray diffraction data collected at pressures up to similar to 50 GPa reveals that there are no structural changes associated with the electronic transitions in Fe3C. Our Rapid Communication resolves the long-standing controversy regarding the nature of phase transitions in Fe3C at high pressures.
Structurally hidden magnetic transitions in Fe3C at high pressures / C. Prescher, L. Dubrovinsky, C. McCammon, K. Glazyrin, Y. Nakajima, A. Kantor, M. Merlini, M. Hanfland. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 85:14(2012).
Structurally hidden magnetic transitions in Fe3C at high pressures
M. MerliniPenultimo
;
2012
Abstract
We report a Mossbauer spectroscopic study of cementite (Fe3C) in a diamond anvil cell up to 88 GPa. The hyperfine parameters reveal a two-stage loss of magnetism in Fe3C: a ferro-to-paramagnetic transition around 8-10 GPa and a spin transition at about 22 GPa. Full structural refinement based on single-crystal x-ray diffraction data collected at pressures up to similar to 50 GPa reveals that there are no structural changes associated with the electronic transitions in Fe3C. Our Rapid Communication resolves the long-standing controversy regarding the nature of phase transitions in Fe3C at high pressures.
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