Original scientific paper
X-ray study of dispersiveness of cadmium sulphide-manganese sulphide systems obtained by coprecipitation
M. Paić
; Institute of Physics of the University of Zagreb, Zagreb
K. Kranjc
; Institute of Physics of the University of Zagreb, Zagreb
V. Paić
; Institute of Physics of the University of Zagreb, Zagreb
Abstract
The dispersiveness of CdS-MnS systems, obtained by coprecipitation from aqueous solutions of corresponding sulphates by (NH4)2S, was investigated by means of the broadening of Debye-Scherrer lines and small-angle X-ray scattering. An estimate of the size of crystallites was deduced from the half-width of a line in common to the hexagonal and cubic phases. The analysis of the small-angle scattering curves, applying two independent procedures, has given a consistent picture of the systems. The systems are granular, formed of approximately spherical particles. These often are clusters of as much as several hundreds of small crystallites. All parameters describing the systems show a remarkable dependence on the amount of MnS. In particular the parameters related to the size of the particles have a very pronounced maximum in the critical region of precipitation, where the amount of MnS is near 0.1 mol %. The specific surface has a minimum at the same value. The number of crystallites forming a particle diminishes abruptly in the critical region.
Keywords
Hrčak ID:
321596
URI
Publication date:
8.11.1971.
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