Y/sub 2/Rh/sub 3/Ge, a rhombohedral substitution variant of the MgCu/sub 2/ type

Journal Article · Thu Oct 01 00:00:00 EDT 1987 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(87)90061-2· OSTI ID:5853353

Cenzual, K; Chabot, B; Parthe, E

The structure of Y/sub 2/Rh/sub 3/Ge has been determined and refined from single-crystal x-ray diffraction data (R = 0.042). It is a rhombohedral, ternary, ordered variant of the cubic Laves structure type MgCu/sub 2/, with space group R3 vector m, Z = 3, a = 5.552(3) and c = 11.82(1) A for the triple hexagonal cell. The c/a ratio (2.13) is significantly lower than the value for the triple hexagonal cell of the cubic lattice of the parent structure type (2.45), resulting in shorter distances between Rh and Ge atoms than between Rh atoms. The isotypy of Pr/sub 2/Rh/sub 3/Si, Er/sub 2/Rh/sub 3/Si, Pr/sub 2/Rh/sub 3/Ge, and Er/sub 2/Rh/sub 3/Ge has been established from Guinier films. The Y/sub 2/Rh/sub 3/Ge structure is compared with the binary compound YRh/sub 2/, crystallizing with the MgCu/sub 2/ structure, and with three other simple, ternary, ordered substitution derivatives of the Laves phase types MgZn/sub 2/ and MgCu/sub 2/.

• Research Organization: Universite de Geneve, Switzerland
• OSTI ID: 5853353
• Journal Information: J. Solid State Chem.; (United States), Vol. 70:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GERMANIUM ALLOYS
CRYSTAL STRUCTURE
RHODIUM ALLOYS
YTTRIUM ALLOYS
EXPERIMENTAL DATA
HEXAGONAL LATTICES
LATTICE PARAMETERS
LAVES PHASES
MONOCRYSTALS
SOLID SOLUTIONS
SPACE GROUPS
X-RAY DIFFRACTION
ALLOYS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTALS
DATA
DIFFRACTION
DISPERSIONS
INFORMATION
MIXTURES
NUMERICAL DATA
PLATINUM METAL ALLOYS
SCATTERING
SOLUTIONS
360102* - Metals & Alloys- Structure & Phase Studies