Multifunctional characterisation of pressureless sintered Al₂O₃ –CaTiO₃ nanocomposite

Abstract This paper highlights the synthesis and processing of alumina−calcium titanate (Al 2 O 3 –CaTiO 3 ) composite for multifunctional application in the biomedical industry. In this work, the Al 2 O 3 –CaTiO 3 composite was synthesized using sol-gel techniques. Calcium oxide, aluminum isopropoxide, titanium isopropoxide, ethanol, and nitric acid were used as precursor chemicals, solvents, stabilizers, and catalysis, respectively. The powder was calcined at a temperature of 800 °C for 1 h. The densification and sintering behavior of uniaxially pressed calcined powder was carried out using a pressureless sintering electric furnace at a temperature of 1,400 °C for 2 h. X-ray diffraction and scanning electron microscopy analysis were used to determine the phases and morphology of powders and sintered nano-composite. The impedance analysis was used to investigate the electrical properties of the sintered composite. As a result, the phases and morphology of Al 2 O 3 and CaTiO 3 were confirmed by X-ray diffraction, scanning electron microscopy and high resolution transmission electron microscopy analysis. Impedance analysis indicates the increasing dielectric constant and AC conductivity of the sintered sample with the function of temperature and frequency. Finally, it can be concluded that the biocompatibility of both phases could potentially be fabricated and used in biomedical industries as a functional biomaterials application.