Abstract
A preliminary transmission electron microscopy study of the YCr 3S 6 phase has been performed. The compound crystallises with an orthorhombic average structure, space group Pmnb, a=3.485 (2) Å, b=10.847 (3) Å, c=12.701 (3) Å. The average crystal structure can be related to the CaFe 2O 4-type . In addition, the electron diffraction patterns show a three-fold superstructure along the a axis due to an ordered occupancy of the trigonal prismatic environment position by the yttrium atoms. In some cases it has been found that the modulation is slightly incommensurate. The presence of disorder giving rise to layers of diffuse intensity perpendicular to a* is related to the electron beam interaction as well as changes in the phase of the structure modulation.
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