Investigation of structural and dielectric characteristics of La2Ni0.5Al0.5MnO6double perovskite ceramics

Abstract

Double perovskite materials provide the versatility of interesting physical properties and applications. Among double perovskites, La2NiMnO6 has received scientific attention due to its field-induced magnetic and dielectric properties near room temperature. In the present study, polycrystalline La2Ni0.5Al0.5MnO6 double perovskite has been prepared via a standard Pechini sol-gel method followed by high-temperature sintering. The effect of Al substitution on structural and dielectric characteristics of La2Ni0.5Al0.5MnO6 was examined. The sample crystalizes in the monoclinic symmetry with P21/n space group. The dielectric analysis showed that the giant dielectric constant in La2Ni0.5Al0.5MnO6 in association with relaxor-like behavior originating from the polar arrangement of electrons or polarons due to mixed-valent Ni2+,3+/Al3+, and Mn3+,4+ cations. © 2020 Author(s).