Acta Crystallographica Section B

Structural Science

Volume 62, Part 5 (October 2006)

research papers

Acta Cryst. (2006). B62, 710-718 [ doi:10.1107/S0108768106025900 ]

Modulated corrugations in the crystal structure of the superconductor CaAlSi

K. M. Sparta, R. Müller, M. Merz, G. Roth, P. Adelmann and T. Wolf

Abstract: We report the crystal structure analyses of CaAlSi from single-crystal and powder X-ray diffraction and the existence of two commensurately modulated phases, a sixfold and a fivefold modulated structure. This polymorphism seems to be correlated to the thermal history of the sample. We describe both modulated structures using a three-dimensional and a (3 + 1)-dimensional formalism.

Keywords: superconductors; CaAlSi; single-crystal X-ray diffraction; powder X-ray diffraction; commensurately modulated structures.


	Structure factor file (CIF format) (16.1 kbytes) [ doi:10.1107/S0108768106025900/ck50166-foldsup2.hkl ] Contains datablock 6-fold_superstructure_(298K)

	Structure factor file (CIF format) (15.7 kbytes) [ doi:10.1107/S0108768106025900/ck50165-foldsup3.hkl ] Contains datablock 5-fold_superstructure_(298K)

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