Low-Frequency Dielectric Analysis of Promising Lead-Free DabcoH+A− Ferroelectric Materials for Energy Applications

Low Frequency Dispersion (LFD) is a common feature of dielectric materials that was identified in the late 1970s. It is linked to the many body interactions of dipoles and charges in dielectric materials and informs on the conduction mechanisms of materials at low frequency, especially in ionic materials. DabcoHClO4 is an ionic lead-free ferroelectric material showing relatively high remnant polarization among organic materials and is built around linear hydrogen links, making it a good candidate for flexible electronics, especially mixed with polymers. Dielectric spectroscopy characterization is performed on dabcoHClO4 pellets to measure dielectric constant and losses, ac conductivity dielectric modulus and impedance above and below the Curie temperature. The low frequency behavior reveals the presence of LFD and gives new insights to understand the conduction mechanisms of this family of hybrid molecular ionic materials.