Modulated corrugations in the crystal structure of the superconductor CaAlSi

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

doi:10.1107/S0108768106025900

Acta Crystallographica Section B
Acta Crystallographica
Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS

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Figure 4
Reconstructed image of the $[(h\bar{h}0l)]$ reciprocal plane of the fivefold superstructure of CaAlSi. The strong reflections correspond to the average structure with the symmetry P6/mmm; they are separated along the c* axis (horizontal) by four superstructure reflections. The weak ( $[{{1}\over{2}}]$ $[ {{\bar{1}}\over{2}}]$ $[ {{\bar{5}}\over{2}}]$ ), ( $[{{1}\over{2}}]$ $[ {{\bar{1}}\over{2}}]$ $[ {{5}\over{2}}]$ ), ( $[{{\bar{1}}\over{2}}]$ $[ {{1}\over{2}}]$ $[ {{5}\over{2}}]$ ) and ( $[{{\bar{1}}\over{2}}]$ $[ {{1}\over{2}}]$ $[ {{\bar{5}}\over{2}}]$ ) reflections around the centre of the image are due to the $[\lambda]$ /2 radiation. The intensities are rescaled to the interval 0 (white) to 100 (black); the stronger peaks are clipped (highest intensity in this figure: over 64 000 counts per pixel).

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 62| Part 5| September 2006| Pages 710-718

doi:10.1107/S0108768106025900

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