Hydrogen absorption and 57Fe Mössbauer effect in UFeGe

In Situ Hydrogenation and Crystal Chemistry Studies of Co2Si Type Compounds MgPd2 and Pd2Zn

“…Orthogonalized lattice parameters of the hexagonal filled ZrBeSi type have similar axial ratios and would be next to TbNiSiD 1.78 with a/c ratio larger than 1.0 in Figure . There are some more germanide and antimonide hydrides in filled TiNiSi type structure, e.g., UFeGeH 0.3 , UCoGeH 0.1 , URhGeH 0.3 , UPdGeH 0.1 , UIrGeH 0.1 , CeRhSbH 0.2 , and CeIrSbH 0.8 , however, they incorporate only a small hydrogen amount and two of them switch to the filled ZrBeSi type through a phase transition by higher hydrogen uptake (UFeGeH 1.7 and UNiGeH 0.3–1.2 ). The hydrides CeNiGeH 1.6 , TbNiGeD 1.8 , and CeAuAlH 1.4 , that crystallize in filled ZrBeSi type and CeCuGeH crystallizing in a threefold superstructure of the ZrBeSi type, are mentioned here for the sake of completeness.…”

Hydrogen in actinides: electronic and lattice properties

“…The γ-value is approximately doubled in the hydride (≈100 mJ mol −1 K −2 ) compared to the pure UCoGe with 65 mJ mol −1 K −2 [133]. From the non-magnetic side of the UTGe compounds, the hydrogenation study has been performed for UFeGe, a weak paramagnet with γ = 12 mJ mol −1 K −2 [134]. The hydride UTGeH 1.7 has γ enhanced to 36 mJ mol −1 K −2 .…”

Variations of structure and magnetic properties in UTGe hydrides (T=late transition metal)

“…The coefficients for selected UTGe hydrides were estimated from the linear extrapolation of C p /T vs. T 2 to T = 0 K. The fittings (according to the formula: C p /T = + ˇT 2 ) were done mostly in the T 2 range between 4 and 200 K 2 , yielding the coefficients of 36 mJ/mol K 2 for UFeGeH 1.7 comparing with 12 mJ/mol K 2 for UFeGe [12], 66 mJ/mol K 2 for the ␣-hydride of UCoGe, 103 mJ/mol K 2 for UCoGeH 1.7 and 111 mJ/mol K 2 for two-␤-phase hydride comparing with 51 mJ/mol K 2 for UCoGe [13], 70 mJ/mol K 2 for UNiGeH 1.2 in comparison to 23 mJ/mol K 2 for UNiGe [16] and 16 mJ/mol K 2 for UPdGeH 0.1 . An enhancement of coefficient by about 200% in UFeGeH 1.7 and UNiGeH 1.2 or 100% in UCoGeH 1.7 means that hydrogenation leads to the 5f-band narrowing and, consequently, to an increase of magnetic moments and/or decrease of the degree of 5f-ligand hybridization.…”

“…Temperature dependence of magnetic susceptibilities for UFeGeHx and UFeGe measured in 0H = 2 T[12]. The inset shows the temperature dependence of magnetic susceptibilities corrected for F impurity at T = 300 K.3.1.4.…”