Ferroelectricity in Dion–Jacobson ABiNb2O7 (A = Rb, Cs) compounds

Abstract

The ferroelectric properties of 2-layer Dion–Jacobson compounds ABiNb₂O₇ (A = Rb and Cs) were studied. Ferroelectricity and piezoelectricity of CsBiNb₂O₇ were demonstrated for the first time. The ferroelectric domain structure of Dion–Jacobson compounds were imaged using PFM. The Curie points of RbBiNb₂O₇ and CsBiNb₂O₇ are 1098 ± 5 and 1033 ± 5 °C, respectively. The piezoelectric constant of RbBiNb₂O₇ and CsBiNb₂O₇ are approximately 5 and 8 pC N⁻¹. Thermal depoling was also studied to confirm the Curie temperature and the stability of the piezoelectricity.