Abstract
Quaternary CrSBr 0.67Cl 0.33 was obtained as black needles by heating chromium powder with a mixture of S 2Br 2 and S 2Cl 2 at 1273 K. It was found from X-ray precession photographs and an X-ray diffraction powder structure determination to be isostructural with CrSBr crystallizing in the FeOCl structure type (space group Pmmn, a = 476.73(4), b = 346.65(3), and c = 779.25(8) pm; R exp = 9.7%). The reason of the partly opposite change of the Cr–X (X = halogen) and Cr–S distances on going from CrSBr to CrSBr 0.67Cl 0.33, compared with that expected for substitution of bromium ions by smaller chlorium ones, is discussed.
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