Modulated crystal structure of Pr₂SbO₂

The crystal structure of commensurately modulated Pr₂SbO₂ was solved in the orthorhombic superspace group Immm(0β0)000 from a crystal twinned by reticular pseudomerohedry. The formation of Zintl-type Sb²⁻–Sb²⁻ dumbbells in Pr₂³⁺Sb²⁻O₂²⁻ is considered to be responsible for its semiconducting properties.