Abstract
IN the system Mo-S the only compound that is formed by direct synthesis from the elements is the disulphide MoS2. This compound exists in two modifications : (1) The well-known hexagonal form (a=3.16 ; c=12.29 A.), the structure of which1 is shown in Fig. 1a. (2) The rhombohedral form (a=3.17 ; c=18.38 A.) which was first described by Bell and Herfert2. These authors propose a CdCl2-type structure which, however, is incompatible with their own and our X-ray diffraction data. Good agreement is found for the structure shown in Fig. 1b. This structure can be described in space-group R3m—C 5 3ν : 3 Mo situated in 3(a) ; 0 0 z, etc., with z=0 ; 3 S I in 3(a) with z≈¼ and 3 S II in 3(a) with z≈5/12.
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References
Dickinson, R. G., and Pauling, L., J. Amer. Chem. Soc., 45, 1465 (1923).
Bell, R. E., and Herfert, R. E., J. Amer. Chem. Soc., 79, 3351 (1957).
Hahn, H., and Harder, B., Z. anorg. Chem., 288, 241 (1956).
Krönert, W., and Plieth, K., Naturwiss., 45, 416 (1958).
Hägg, G., and Schönberg, N., Arkiv Kemi, 7, 371 (1954).
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JELLINEK, F., BRAUER, G. & MÜLLER, H. Molybdenum and Niobium Sulphides. Nature 185, 376–377 (1960). https://doi.org/10.1038/185376a0
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DOI: https://doi.org/10.1038/185376a0
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