The crystal structures and lattice parameters of high-purity scandium, yttrium and the rare earth metals

Abstract

The crystal structures and accurate lattice constants of scandium, yttrium and the rare earth metals are given, and the values of their calculated mole-atomic volumes, densities, axial ratios and metallic radii are graphically compared. Expected variations due to the 'lanthanide contraction' and structure differences are noted, and additional irregularities in the axial ratio and metallic radii plots are indicated.

Different routes to pressure-induced volume collapse transitions in gadolinium and terbium metals

“…XAFS shows a systematic reduction in Y-RE distance in going from Pr to Tb (see Table I) as expected from the well known lanthanide contraction. Furthermore, the Y-RE distances are in very close agreement with the RE-RE distances in the pure compounds ( Table I; we note that the first neighbor distances for the pure Y and RE metals are similar 44 ). The presence of a clear lanthanide contraction in the Y(RE) alloys, which results from the response of outer spd valence electrons to an increasingly attractive nuclear potential poorly screened by the additional 4f electrons, is additional evidence for the closely matched character of spd conduction electrons in the Y(RE) alloys and the pure RE metals.…”

New Scandium Platinum Silicides: ScPt2Si with ‘Inverse’ MgCuAl2 Structure and Sc5Pt9Si7, a Variant of the Zr2Fe12P7‐Type

“…This results in a clustering of the Sc1 atoms ( Figure 5a) and Sc1-Sc1 distances of 3.396(8) Ǻ, which are the shortest distances between scandium atoms in the structure. They are, however, still larger than those observed in hcp scandium (3.254 and 3.309 Ǻ [20]). All other Sc-Sc distances are larger than 3.78 Ǻ indicating the absence of bonding interactions.…”

Extended X-ray absorption fine structure study of the Er bonding in AlNO:Erx films with x ≤ 3.6%

“…Er metal, 18 Er2O3, 19 ErN, 20 comprehensive work by our colleagues, were taken into account. 17 The Fourier transform amplitudes of the theoretical k 3 -weighted (k) spectra, obtained using the above mentioned models, are compared with the experimental spectrum of the AlNO film that contains 2.8% Er in Fig.…”