Fabrication of nanocrystalline CuO powder and giant dielectric properties of its ceramic

CuO nanoparticles of 80 nm were successfully prepared by solution method. X-ray diffraction and scanning electron microscopy were used to characterize the phase formation and microstructure of the CuO powder and ceramics, respectively. CuO ceramics were obtained by sintering the CuO nanocrystalline powder at 900 (PR-900) and 950 °C (PR-950) for 10 h in air. Giant dielectric properties of the sintered CuO ceramics were investigated as functions of temperature, frequency, dc bias, and uniaxial compressive stress. It was found that the uniaxail compressive stress and dc bias had a remarkable effect on the giant low-frequency dielectric properties of the CuO ceramics.