Na2MoO2−δF4+δ – a perovskite with a unique combination of atomic orderings and octahedral tilts†
Abstract
Na2MoO2−δF4+δ (δ ∼ 0.08) displays a unique variant of the perovskite structure, with simultaneous (Na,vacancy) ordering on the A-site, (Na,Mo) ordering on the B-site, (O,F) ordering on the anion site and an unusual NaNbO3-like octahedral tilt system.