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All sourcesNASA NTRSDOE OSTI
NASA NTRS1984

Intermediate phases in some rare earth-ruthenium systems

The phase equilibria and crystal structures of intermediate phases were investigated in eight representative RE-Ru systems using powder X-ray diffraction and metallographic techniques. The Fe3C, Mn5C2 and Er5Ru3 structures occur in all but the Ce-Ru systems. Phases analogous to Er5Ru3 possess an unknown crystal structure similar to Er5Rh3(I). MgCu2 and MgZn2 type Laves phases are encountered in the light rare earth and heavy rare earth systems, respectively, and RERu2 phases, where RE = Nd and Sm, possess both the Laves phase structures. An intermediate phase, NdRu, with an unknown structure, occurs only in the Nd-Ru system. A bcc structure with 40 atoms per unit cell is encountered in the phases Er3Ru2 and Y3Ru2. The behavior of cerium in Ce-Ru alloys is unique in that four unidentified structures, not encountered in other RE-Ru systems, have been encountered. Also a phase designated as Ce3Ru is found with the Th7Fe3 type structure.

Sharifrazi, P.↗
DOE OSTI2020

Materials Data on Ce7Ru3 by Materials Project

Ce7Ru3 crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. there are three inequivalent Ce sites. In the first Ce site, Ce is bonded in a distorted water-like geometry to four equivalent Ru atoms. There are two shorter (2.83 Å) and two longer (3.42 Å) Ce–Ru bond lengths. In the second Ce site, Ce is bonded in a 3-coordinate geometry to four equivalent Ru atoms. There are a spread of Ce–Ru bond distances ranging from 2.70–3.40 Å. In the third Ce site, Ce is bonded in a 3-coordinate geometry to three equivalent Ru atoms. All Ce–Ru bond lengths are 2.97 Å. Ru is bonded in a 6-coordinate geometry to nine Ce atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce4Ru3 by Materials Project

Ce4Ru3 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are three inequivalent Ce sites. In the first Ce site, Ce is bonded in a 1-coordinate geometry to six Ru atoms. There are a spread of Ce–Ru bond distances ranging from 2.73–3.29 Å. In the second Ce site, Ce is bonded in a 4-coordinate geometry to four Ru atoms. There are a spread of Ce–Ru bond distances ranging from 2.73–3.08 Å. In the third Ce site, Ce is bonded in a 6-coordinate geometry to six Ru atoms. There are a spread of Ce–Ru bond distances ranging from 2.74–2.89 Å. There are two inequivalent Ru sites. In the first Ru site, Ru is bonded in a 5-coordinate geometry to seven Ce atoms. In the second Ru site, Ru is bonded in a 2-coordinate geometry to eight Ce atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeRu2 by Materials Project

CeRu2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Ce is bonded in a 12-coordinate geometry to twelve equivalent Ru atoms. All Ce–Ru bond lengths are 3.14 Å. Ru is bonded to six equivalent Ce and six equivalent Ru atoms to form a mixture of edge, face, and corner-sharing RuCe6Ru6 cuboctahedra. All Ru–Ru bond lengths are 2.68 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce3Ru by Materials Project

Ce3Ru is Cementite structured and crystallizes in the orthorhombic Pnma space group. The structure is two-dimensional and consists of two Ce3Ru sheets oriented in the (0, 0, 1) direction. there are two inequivalent Ce sites. In the first Ce site, Ce is bonded in a 2-coordinate geometry to two equivalent Ru atoms. Both Ce–Ru bond lengths are 2.87 Å. In the second Ce site, Ce is bonded in a bent 150 degrees geometry to two equivalent Ru atoms. There are one shorter (2.60 Å) and one longer (2.82 Å) Ce–Ru bond lengths. Ru is bonded in a 6-coordinate geometry to six Ce atoms.

36 MATERIALS SCIENCE↗