research papers
The crystal structure of 0.06% Ce-doped SrMgF4, strontium magnesium tetrafluoride, reported by Ishizawa et al. [(2001), Acta Cryst. C57, 784–786] is shown to satisfy the structural criteria for ferroelectricity and to have a predicted Curie temperature Tc ≃ l450 K. The estimated spontaneous polarization Ps ≃ 11 × 10−2 C m−2 is consistent with classification as a two-dimensional ferroelectric in which minor Δx and major Δy, Δz atomic coordinate component displacements are required for ferroelectric switching.