A new layered perovskite, KSrNb₂O₆F, by powder neutron diffraction

KSrNb₂O₆F consists of double perovskite slabs, [SrNb₂O₆F]^-, and inter­layer K⁺ ions. Within the perovskite slabs, the NbO₅F octa­hedra are tilted about the a axis and the O^2- and F^- ions exhibit an ordered distribution.