Ternary arsenides ACuAs{sub 2} and ternary antimonides AAgSb{sub 2} (A = rare-earth elements and uranium) with HfCuSi{sub 2}-type structure
- 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, Vol. 115, Issue 2; Other Information: PBD: Mar 1995
- Country of Publication:
- United States
- Language:
- English
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