Affiliation:
1. Institut für Anorganische und Analytische Chemie , Universität Münster , Corrensstrasse 30 , 48149 Münster , Germany
Abstract
Abstract
The copper-rich intermetallic compounds CaCu9Mg2 and SrCu9Mg2 were synthesized by induction melting of the elements and subsequent annealing in a muffle furnace. CaCu9Mg2 and SrCu9Mg2 crystallize with the TbCu9Mg2 type structure, space group P 63/mmc, which is a ternary ordered variant of CeNi3. The polycrystalline samples were characterized through their X-ray powder patterns. The CaCu9Mg2 structure was refined from single-crystal X-ray diffraction data. a = 504.13(9), c = 1622.5(3) pm, wR2 = 0.0635, 302 F2 values and 19 variables. The two striking coordination polyhedra in the CaCu9Mg2 structure are Ca@Cu18Mg2 and Mg@Cu12Mg3Ca. These polyhedra condense to layers which are stacked in ABA′B′ sequence. The X-ray data give no hint for Ca/Mg mixing.
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science
Reference40 articles.
1. D. T. Cromer, C. E. Olsen, Acta Crystallogr.1959, 12, 689.
2. L. Paccard, D. Paccard, J. Less-Common Met.1985, 109, 229.
3. O. I. Bodak, E. I. Gladyshevskii, Inorg. Mater.1970, 6, 1037.
4. Y. B. Kuz’ma, N. S. Bilonizhko, S. I. Mykhalenko, G. F. Stepanchikova, N. F. Chaban, J. Less-Common Met.1979, 67, 51.
5. P. Solokha, V. Pavlyuk, A. Saccone, S. De Negri, W. Prochwicz, B. Marciniak, E. Różycka Sokołowska, J. Solid State Chem.2006, 179, 3073.