Pr sub 2 ReC sub 2 and other ternary rare earth metal rhenium carbides with filled PbCl sub 2 (Co sub 2 Si) structure

Journal Article · Thu Nov 01 00:00:00 EST 1990 · Journal of Solid State Chemistry; (USA)

DOI:https://doi.org/10.1016/0022-4596(90)90311-K· OSTI ID:6073462

Jeitschko, W; Block, G; Kahnert, G E; Behrens, R K ^[1]

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1. Universitaet Muenster (West Germany)

The carbides R{sub 2}ReC{sub 2} (R = Y, Ce-Nd, Sm, Gd-Tm, Lu) were prepared by arc-melting of cold-pressed pellets of the elemental components. They crystallize with the orthorhombic space group Pnma and Z = 4 formula units per cell. The lattice constants for Pr{sub 2}ReC{sub 2} are: a = 655.69(6) pm, b = 509.46(5) pm, c = 984.42(8) pm. The crystal structure was determined from quantitative evaluations of Guinier powder data for Y{sub 2}ReC{sub 2} and Pr{sub 2}ReC{sub 2}, which refined to conventional residuals of R = 0.088 and R = 0.072, respectively. The structure of the isotypic carbide Er{sub 2}ReC{sub 2} was determined from single-crystal diffractometer data: R = 0.032 for 842 structure factors and 26 variable parameters. The positions of the metal atoms correspond to those of the Co{sub 2}Si-branch of the anti-PbCl{sub 2} structure. The carbon atoms are isolated from each other and occupy two different octahedral voids (4R + 2Re, 5R + 1Re).

• OSTI ID: 6073462
• Journal Information: Journal of Solid State Chemistry; (USA), Vol. 89:1; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM CARBIDES
CRYSTAL STRUCTURE
DYSPROSIUM CARBIDES
ERBIUM CARBIDES
GADOLINIUM CARBIDES
HOLMIUM CARBIDES
LUTETIUM CARBIDES
NEODYMIUM CARBIDES
PRASEODYMIUM CARBIDES
RHENIUM CARBIDES
SAMARIUM CARBIDES
TERBIUM CARBIDES
THULIUM CARBIDES
YTTRIUM CARBIDES
EXPERIMENTAL DATA
LATTICE PARAMETERS
MEASURING METHODS
ORTHORHOMBIC LATTICES
SPACE GROUPS
CARBIDES
CARBON COMPOUNDS
CERIUM COMPOUNDS
CRYSTAL LATTICES
DATA
DYSPROSIUM COMPOUNDS
ERBIUM COMPOUNDS
GADOLINIUM COMPOUNDS
HOLMIUM COMPOUNDS
INFORMATION
LUTETIUM COMPOUNDS
NEODYMIUM COMPOUNDS
NUMERICAL DATA
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
RHENIUM COMPOUNDS
SAMARIUM COMPOUNDS
TERBIUM COMPOUNDS
THULIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies