期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 92, 期 4, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.92.043702
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Mossbauer spectra of polycrystalline e-57FeOOH were measured up to 14.6 GPa at room temperature using the energy-domain synchrotron 57Fe Mossbauer source at BL11XU in SPring-8. Based on measurements with and without an external magnetic field, e-FeOOH exhibits antiferromagnetic behavior at ambient pressure and temperature. Compression-induced changes in the quadrupole shift 2e, observed at -8 GPa, suggest a magnetic spin rotation and indicate a third pressure-induced transition in addition to hydrogen-bond symmetrization and electronic spin transition, without significant structural changes as observed by previous XRD studies.
Mossbauer spectra of polycrystalline e-57FeOOH were measured up to 14.6 GPa at room temperature using the energy-domain synchrotron 57Fe Mossbauer source at BL11XU in SPring-8. Based on measurements with=without an external magnetic field, e-FeOOH appears to be antiferromagnetic at ambient pressure and temperature. On compression, the quadrupole shift 2e shifted from negative to positive at -8 GPa, which is consistent with a magnetic spin rotation. Previous XRD studies did not detect any transitions at this pressure; thus we infer the change in 2e to be the third pressure-induced transition without major structural change in addition to the hydrogen-bond symmetrization and electronic spin transition.
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