Magnetic iron sulfide of the γ-Al2O3 type

Ferromagnetic iron sulfide Fe₂S₃ of spinel‐type structure was synthesized chemically. The crystal structure of this sulfide was geometrically similar to that of γ‐Al₂O₃ and γ‐Fe₂O₃ containing vacancies. The formula ${\mathrm{Fe}}^{\mathrm{III}}{\mathrm{\hspace{0.17em}(\square }}_{\text{1/3}}{\mathrm{Fe}}_{\text{5/3}}^{\mathrm{III}}){\mathrm{S}}_4$ was postulated as a vacancy structure isomorphous with ${\mathrm{Fe}}^{\mathrm{II}}{\mathrm{Fe}}_2^{\mathrm{III}}{\mathrm{S}}_4.$ The magnetic characteristics of this sulfide were similar to those of greigite Fe₃S₄.