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- Title
The monoclinic superstructure of the M<sub>2</sub>Pt<sub>6</sub>Al<sub>15</sub> series (M = Ca, Sc, Y, La, Lu).
- Authors
Radzieowski, Mathis; Stegemann, Frank; Hoffmann, Rolf-Dieter; Janka, Oliver
- Abstract
The five ternary intermetallic compounds M2Pt6Al15 (M = Ca, Sc, Y, La, Lu) were prepared from the elements by arc-melting. The crystal structure was determined via single crystal X-ray diffraction. The title compounds crystallize in a superstructure of the RE0.67Pt2Al5 type structure (P63/mmc) in the monoclinic crystal system with space group P121/m1 (Sc2Pt6Al15: a = 734.19(2), b = 1628.96(10), c = 734.19(2) pm, β = 119.999(3)°; wR = 0.0356, 3034 F2 values, 68 variables). The superstructure can be derived by the superspace formalism using (3 + 2)D or (3 + 1)D interpretations of the diffraction data. The structural relation to the subcell structure is discussed on the basis of a group-subgroup scheme. In the crystal structure strongly bonded [Pt2Al4]δ- slabs are alternatingly stacked with ordered layers containing M atoms and Al3 triangles.
- Subjects
INTERMETALLIC compounds; PLATINUM compounds; MONOCLINIC crystal system; X-ray diffraction; MELTING
- Publication
Zeitschrift für Kristallographie. Crystalline Materials, 2017, Vol 232, Issue 10, p675
- ISSN
2194-4946
- Publication type
Article
- DOI
10.1515/zkri-2017-2050