Exploring Relaxation Phenomenon in Cu-Substituted Ba2NiWO6 Double Perovskites

Abstract

Double perovskites are an emerging class of functional materials with a great deal of durability perspective owing to their inherent flexibility in cation coordination selection. Here, we synthesized pristine and Cu2+-doped Ba2NiWO6 utilizing the solid-state reaction route to investigate their structural, morphological, and dielectric behavior. Structural examination revealed the development of a cubic crystal structure for both compositions, and Cu2+ integration in Ba2NiWO6 decreases the crystallite size. The spherical-shaped grains shrink in size and start agglomeration with Cu2+ incorporation. The incorporation of Cu2+ reduces the grain size, leads to accumulation of space charges at the grain boundaries, and thus, facilitates growth in the space charge polarization. This increases the dielectric constant of the material, thus making these compositions viable for advanced miniaturized electronic devices.