Dielectric and transport properties of copper-substituted bi-calcium phosphate nanocomposites: Its structural and microstructural evaluation

A detailed investigation of dielectric and electrical transport behavior of the compressed polycrystalline copper substituted biphasic calcium phosphate (Cu-BCP) [hydroxyapatite (HAp) + beta-tricalcium phosphate (beta-TCP)] was carried out. Their structural, microstructural, and chemical characterizations confirmed the phase purity, constituent phase percentages, and bulk porosity of the prepared nanocomposite due to Cu substitution. Due to increased Cu doping, the structural modifications helped to enhance dielectric permittivity with low dielectric loss. The impurity ion-induced defect states, secondary phase percentage, bulk porosity, and crystallinity have influenced the space charge polarization process within the grain-grain boundary-electrode interior. Porosity and phase regulated dielectric properties, unique impedance behavior, and rapidly increasing nonlinear leakage current suggest the suitability of the Cu-BCP nanocomposite in future device-based electroceramic applications.

Automated summary

A detailed investigation was conducted on the dielectric and electrical transport behavior of compressed polycrystalline copper substituted biphasic calcium phosphate. The study revealed that Cu doping improved the dielectric properties of the material, and the porosity and phase composition influenced its electrical performance. The Cu-BCP nanocomposite shows potential for future device-based electroceramic applications.