  Our searches for new oxide chalcogenides of rare earths and Fe, Co, Ni, and
Zn resulted in preparation of two new compounds Ce2Fe2O3S2 and Pr2Fe2O3S2 which
are isostructural to La2Fe2O3Se2 and Sm2Ti2O3Sb2. Crystal structures of the new
compounds Ce2Fe2O3S2 and Pr2Fe2O3S2 were determined from powder X-ray
diffraction data. Magnetic measurements were performed for Ce2Fe2O3S2 and
revealed behavior very similar to that of isostructural oxide chalcogenides of
iron and pnictides of titanium. In particular, no superconductivity was
observed down to 4 K. Crystal chemical factors determining the stability of the
La2Fe2O3Se2 structure type are discussed.
