A single crystal study of RE14Co3In3 (RE = Y, Tb, Dy, Ho, Er)

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Abstract

The rare earth-cobalt-indides RE14Co3In3 (RE = Y, Tb, Dy, Ho, Er) were prepared in polycrystalline form from the elements by arc-melting. Small single crystals were grown through a special annealing sequence. The compounds were investigated on the basis of X-ray powder and single crystal data: Lu14Co2In3 (Gd 14Co3In2.7) type, P42/nmc, Z = 4, a = 959.0(1), c = 2319.1(5) pm, wR2 = 0.055, 2289 F2 values, 65 variables for Y13.90Co2.99In3.02, a = 953.8(1), c = 2315.8(5) pm, wR2 = 0.108, 2357 F2 values, 65 variables for Tb13.92Co3.01In2.92, a = 949.24(3), c = 2296.5(1) pm, wR2 = 0.129, 2518 F2 values, 65 variables for Dy 13.90Co2.97In2.95, a = 946.3(1), c = 2289.0(5) pm, wR2 = 0.099, 2297 F2 values, 64 variables for Ho 14Co2.80In2.89, and a = 941.0(1), c = 2274.2(5) pm, wR2 = 0.140, 2450 F2 values, 65 variables for Er 13.83Co2.88In3.10. All RE14Co 3In3 indides show a small degree of In/Co mixing (between 7 and 16% Co) on the 4c In1 site and defects on the 8g Col positions (between 84 and 95% Co). Except for the holmium compound, the RE14Co 3In3 intermetallics also reveal RE/In mixing on the 4c RE1 sites, leading to the refined compositions. The seven crystallographically independent RE sites have between 9 and 10 nearest RE neighbors. The RE 14Co3In3 structures consist of a complex intergrowth of rare earth based polyhedra. Both cobalt sites have a distorted trigonal-prismatic rare earth coordination. An interesting feature is the In2-In2 dumb-bell with an In2-In2 distance of 300 pm (for Ho14Co 2.80In2.89). The crystal chemistry of the RE 14Co3In3 indides is discussed. © 2006 Verlag der Zeitschrift für Naturforschung.

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Zaremba, V. I., Kalychak, Y. M., Dzevenko, M. V., Rodewald, U. C., Heying, B., & Pöttgen, R. (2006). A single crystal study of RE14Co3In3 (RE = Y, Tb, Dy, Ho, Er). Zeitschrift Fur Naturforschung - Section B Journal of Chemical Sciences, 61(1), 23–28. https://doi.org/10.1515/znb-2006-0105

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