New Layered Iron‐Lanthanum‐Oxide‐Sulfide and ‐Selenide Phases: Fe₂La₂O₃E₂(E = S,Se)

A two‐dimensional network of face‐sharing FeO₂E₄ octahedrons (E = S, Se) interspersed with double layers of square E₄O₄ antiprisms, in whose centers lanthanum atoms are situated, is one description of the layers in the unusual structure of the Fe₂La₂O₃E₂ phases (see structure for E = Se on the right). Both the oxidesulfide and the oxideselenide are semiconductors with interesting magnetic properties. (Figure Presented.)