Alkaline earth metal ordering in CaCu9Mg2 and SrCu9Mg2
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Maximilian K. Reimann
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.
Acknowledgements
We thank Dipl.-Ing. J. Kösters for the intensity data collection of CaCu9Mg2.
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©2020 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Graphical Synopsis
- Inorganic Crystal Structures
- Crystallographic orientation of ilmenite inclusions in amphibole – an electron backscatter diffraction study
- Quaternary intermetallics RE2Pt3Ga4In (RE=Y, Gd-Tm) – intergrowth structures of NdRh2Sn4 and TiNiSi related slabs
- Impact of the production method and diagnostics conditions on the compositions and structure of nanodimensional anatase
- Alkaline earth metal ordering in CaCu9Mg2 and SrCu9Mg2
- Elucidating the physical properties of the molybdenum oxide Mo4O11 and its tantalum substituted variant Mo2Ta2O11
- Coordination sequences of 2-uniform graphs
- Silicate-germanate K2Y[(Si3Ge)O10(OH)] with unusual complex corrugated layer and its correlation to ring silicate gerenite and chain silicate chkalovite
- Letter
- On the 80th birthday of Professor (retired) Dr. Dr. h.c. Peter Paufler
Artikel in diesem Heft
- Frontmatter
- Graphical Synopsis
- Inorganic Crystal Structures
- Crystallographic orientation of ilmenite inclusions in amphibole – an electron backscatter diffraction study
- Quaternary intermetallics RE2Pt3Ga4In (RE=Y, Gd-Tm) – intergrowth structures of NdRh2Sn4 and TiNiSi related slabs
- Impact of the production method and diagnostics conditions on the compositions and structure of nanodimensional anatase
- Alkaline earth metal ordering in CaCu9Mg2 and SrCu9Mg2
- Elucidating the physical properties of the molybdenum oxide Mo4O11 and its tantalum substituted variant Mo2Ta2O11
- Coordination sequences of 2-uniform graphs
- Silicate-germanate K2Y[(Si3Ge)O10(OH)] with unusual complex corrugated layer and its correlation to ring silicate gerenite and chain silicate chkalovite
- Letter
- On the 80th birthday of Professor (retired) Dr. Dr. h.c. Peter Paufler
