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In the present study, we have demonstrated recovery of metastable Fe-Mo alloy with bcc structure through novel hydride formation above 6 GPa and structural change from hcp to bcc with dehydrogenation reaction during depressurization at room temperature (RT)., IUCr High-Pressure Workshop 2021

The surface magnetism of Fe(001) was studied in an atomic layer-by-layer fashion by using the in situ iron-57 probe layer method with a synchrotron Mössbauer source. The observed internal hyperfine field exhibits a marked decrease at the surface and an oscillatory behavior with increasing depth in the individual upper four layers below the surface. The calculated layer-depth dependencies of the effective hyperfine field, isomer shift, and quadrupole shift agree well with the observed experimental parameters. These results provide the first experimental evidence for the magnetic Friedel oscillations, which penetrate several layers from the Fe(001) surface.

X-ray diffraction measurements of (NH_3)K_3C_60 have revealed a structural phase transition at T_s=150 K, which is attributed to the orientational order-disorder transition of the K-NH_3 pair at the octahedral site of the C_60 lattice. The low-temperature phase has a face-centered-orthorhombic structure derived by doubling the unit lattice vectors of the high-temperature phase along three axes. The superlattice intensity increases continuously below T_s, which means that the transition is second order. At 100 K