Abstract
A comprehensive account of the author's X-ray and electron diffraction studies on precipitated cadmium sulphide is presented with the following mainconclusions. (1) The precipitates contain invariably stacking faults; precipitates of nearly pure α-CdS (hexagonal) from halide solutions and nearly pure β-CdS (cubic) from nitrate and sulphate solutions are the two extreme case.(2) The stacking fault concerned is ‘Jagodzinski's growth fault’. However, the occurrence of faulty sequences, hex. →cub. and cub. →hex., is comparatively rare. (3) The dependence of atomic structure of the CdS products on the salt solution used should be traced back to the ionic struc-ture of thesolution. (4) The general trend of crystallite-size and 'hexagonality' (fractionof the hexagonal stacking sequence in the crystal) of the CdS products can be understood on the basis of the kinetics of solid-phase formation. (5) The general trend of colour of the precipitate is reason-ably understood.
