A hybrid crystal with high dielectric constant and relaxation dielectric behavior

Abstract

In this study, the crystal structure and dielectric properties of the iodoplumbate-based hybrid crystal, [C6Apy][PbI3] (1) (C6-Apy+ = 1-hexyl-4-aminopyridinium) have been investigated. The hybrid crystal belongs to the orthorhombic system with space group Pbca at room temperature and is composed of one dimensional inorganic chains. The organic cation is incorporated into the space between the inorganic chains along the b-axis. This is a rare inorganic-organic hybrid compound which exhibits a very high dielectric constant at room temperature. A typical dielectric relaxation is observed in the temperature range of 60–130 °C. The dielectric relaxation process exhibits an Arrhenius-type temperature dependence with an activation energy of 0.950 eV. The results indicate that this hybrid, possessing a high dielectric constant, could be a promising actuator material.