- Differential scanning calorimetry study of hydrogen-induced amorphization in GdMn2, PrMn2 and NdMn2 laves phases
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Comparative studies on hydrogen-induced amorphization in the GdMn2, PrMn2 and NdMn2 Laves phases were performed using differential scanning calorimetry (DSC), X-ray diffraction and transmission electron microscopy measurem
- Chung,Lee
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- Structure of the trihydride GdH3
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The unit cell parameters of the trihydride GdH3 (Pearson symbol hP24, space group P3c1, HoH3 type) were determined employing Guinier powder diffraction patterns. The structure of the interstitial compound GdH3 is formed by departing from a hexagonal close-packed substructure of gadolinium and by filling its tetrahedral and triangular atomic positions with hydrogen atoms. The occupation of interstitial atomic positions in the hexagonal close-packed structure causes lattice dilatation associated with a significant change of the axial ratio c/a. In the intermediate phases of the binary system Gd-H, the interatomic distance between gadolinium and hydrogen atoms, dGd-H, decreases with increasing hydrogen content; the shortest dGd-H distance was observed to occur in GdH3. A set of powder diffraction data was obtained for GdH3.
- Ellner,Reule,Mittemeijer
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- ESR of GdF3 and related molecules at 4 K
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The pyramidal (C3ν) GdF3 molecule was trapped in neon and argon matrices at 4 K and its ESR spectrum measured in the X-band region.In neon the spectrum exhibited several off-principal-axis transitions which were sensitive to the assigned magnetic parameters.It was shown to be a S=7/2 molecule (ground state 8A1) with g = 1.995, g = 1.990, and = 0.433 cm-1.The 19F hfs was unresolved and therefore s = + 1/2 - 1/2 transition of GdH3 was observed, yielding = 0.7 to 1.3 cm-1, and it is inferred to be a planar (D3h) molecule (ground state 8A'1).Weak spectra of GdCl3 (8A1) and GdF2 (9A1) were also observed, yielding ca. 0.36 and 0.20 cm-1, respectively.
- Baumann, C. A.,Zee, R. J. Van,Zeringue, K. J.,Weltner, W.
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p. 5291 - 5296
(2007/10/02)
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