Abstract
In this paper, calcium-doped zinc oxide (Ca/ZnO) nanopowders were elaborated via a the sol–gel process. X-ray diffraction analysis of Ca/ZnO nanopowders shows a hexagonal wurtzite structure and that the calcium atoms are successfully inserted into the ZnO lattice. The morphological study reveals that these Ca/ZnO nanopowders are made up of nanoparticles and confirms the hexagonal plane to the prepared nanopowders. The Ca doping of the Ca/ZnO nanopowders considerably improved their crystalline quality and allowed us to make dielectric measurements. During the dielectric processes in the sample, the physical parameters of Ca/ZnO nanopowders at various temperatures 300–450 K such as real part (
ε
′), imaginary part (
ε
″) and loss tangent (tan
δ
) were examined. Obviously, the optical results reveal that the band gap of Ca/ZnO nanopowders prepared by sol–gel process varies in the range of 3.34 to 3.29 eV. In addition, the composition developed by the sol–gel technique exhibits an evolution of the band gap which can be useful for various applications.