Results for “GdNi5” | Engineering Papers

DOE OSTI2020

Materials Data on GdNi5 by Materials Project

GdNi5 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Gd is bonded in a 6-coordinate geometry to eighteen Ni atoms. There are six shorter (2.82 Å) and twelve longer (3.14 Å) Gd–Ni bond lengths. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded to four equivalent Gd and eight Ni atoms to form a mixture of corner, edge, and face-sharing NiGd4Ni8 cuboctahedra. There are four shorter (2.42 Å) and four longer (2.44 Å) Ni–Ni bond lengths. In the second Ni site, Ni is bonded in a 12-coordinate geometry to three equivalent Gd and six equivalent Ni atoms.

36 MATERIALS SCIENCE↗

NASA NTRS1979

Studies of magnetostriction and spin polarized band structures of rare earth intermetallics

Anisotropic magnetostriction measurements of R6Fe23, R = (Tb, Dy, Ho, and Er) were carried out from 77 K to room temperature. Magnetic fields up to 2.1 Tesla were applied. All the compounds exhibited large magnetostrictions at 77 K, the largest effect being obtained for Tb6Fe23. Saturation magnetostriction values for the compounds were also determined for 77 K and room temperature. Results of the temperature dependence of magnetostriction for Er6Fe23 are in good agreement with Callen and Callen's single ion theory. Therefore, the main sources of magnetostriction in this compound is the Er ion. The spin-up and spin-down electronic energy bands, the density of states and the magnetic moments of YCo5, SmCo5, and GdCo5 were calculated by the spin polarized augmented plane wave technique. The calculations obtained show the origin of the moment, provide good estimates of its magnitude and variation, and the reasons for those variations. They also show the important role of partial charge transfer and of d-d electronic coupling. Calculations for LaNi5 and GdNi5 systems are discussed.

Wallace, W. E.↗