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

Journal Article · Thu Oct 01 04:00:00 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), Journal Name: J. Solid State Chem.; (United States) Vol. 70:2; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

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