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DOE OSTI2020

Materials Data on Th7Fe3 by Materials Project

Th7Fe3 crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. there are three inequivalent Th sites. In the first Th site, Th is bonded in a 3-coordinate geometry to three equivalent Fe atoms. All Th–Fe bond lengths are 2.90 Å. In the second Th site, Th is bonded in a distorted water-like geometry to two equivalent Fe atoms. Both Th–Fe bond lengths are 2.75 Å. In the third Th site, Th is bonded in a 3-coordinate geometry to three equivalent Fe atoms. There are two shorter (2.75 Å) and one longer (3.02 Å) Th–Fe bond lengths. Fe is bonded in a 6-coordinate geometry to six Th atoms.

36 MATERIALS SCIENCE↗

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.↗