Ternary arsenides ACuAs{sub 2} and ternary antimonides AAgSb{sub 2} (A = rare-earth elements and uranium) with HfCuSi{sub 2}-type structure

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1995.1138· OSTI ID:75762

Brylak, M; Moeller, M H; Jeitschko, W ^[1]

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1. Anorganisch-Chemisches Institut der Universitaet Muenster (Germany)

The arsenides ACuAs{sub 2} (A = Y, La-Nd, Sm, Gd-Lu) and the isotypic antimonides AAgSb{sub 2} (A = Y, La-Nd, Sm, Gd-Tm, U) were prepared for the first time and their lattice constants are reported. Single crystals of CeAgSb{sub 2} were obtained from a NaCl/KCl flux and their structure was determined from four-circle diffractometer X-ray data: P4/nmm, a = 436.3(1) pm, c = 1069.9(4) pm, Z = 2, R = 0.017 for 381 structure factors and 12 variable parameters. CeAgSb{sub 2} is isotypic with HfCuSi{sub 2}, CaMnBi{sub 2}, and ZrCuSiAs. In contrast to other ternary lanthanoid transition metal antimonides with HfCuSi{sub 2}-type structure, the silver site is fully occupied. Chemical bonding in CeAgSb{sub 2} can be rationalized by the formula Ce{sup 3+}Ag{sup +}Sb{sup {minus}}Sb{sup 3{minus}}, where the superscripts indicate oxidation numbers.

• OSTI ID: 75762
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 115; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ANTIMONIDES
ARSENIDES
COPPER COMPOUNDS
CRYSTAL STRUCTURE
RARE EARTH COMPOUNDS
SILVER COMPOUNDS
URANIUM COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS