Structurally ferroelectric SrMgF4

Abstract

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 T c ≃ l450 K. The estimated spontaneous polarization P s ≃ 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.