Abstract
Gerstleyite [Na2Sb8S13·2H2O] was successfully synthesized by hydrothermal method for the first time. The syntheses condition was as follows: starting material Sb2S3 and Na2S·9H2O soln. with mixing ratio of [Sb/Na]=4.0 and 8.0 (mol/mol), heating temperature 210 and 220°C, and heating time of 80 hours. The products were identified to be gerstleyite by means of X-ray powder diffraction. Space group and lattice constants were examined by a Weissenberg camera. Crystal data: monoclinic, Cm, a=9.945(2), b=23.134(3), c=7.108(1) A, β=127.828(8)°. The lattice parameters of the synthetic gerstleyite are 0.2∼0.4% larger than those reported for natural gerstleyite [Na2(Sb, As)8S13·2H2O], in which about one tenth of the Sb atoms were substituted by smaller As atoms.
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