ABSTRACT: The applicability of static light scattering as a tool for particle sizing is evaluated for spherical core-shell systems. A series of intensity-angle measurements have been made on hematite (a-Fe203) particles covered by yttrium basic carbonate (Y(OH)CO3) shells; size parameters - includint polydispersity- have been deduced by means of the Aden-Kerker scattering theory, and the results have been compared to electron microscopy. Some explanations are given concerning the higher degree of polydispersity yielded by Aden-Kerker theory compared to electron microscopy observations.

Keywords: light scattering; coated spheres; size parameters.