Ferroelectricity in Dion-Jacobson ABiNb<inf>2</inf>O<inf>7</inf> (A = Rb, Cs) compounds

Abstract

© The Royal Society of Chemistry 2015.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. This journal is