The microstructure and dielectric properties of titanium oxide doped with nano CuO

Abstract

The TiO2 ceramics doped with nano CuO were fabricated by the conventional solid-state reaction method. The crystal structure, microstructure, microwave dielectric properties and lattice vibrations of TiO2 ceramics doped with nano CuO have been investigated. Nano CuO with higher sintering capability worked as flux former and effectively improved the sintering process of TiO2 ceramics. The microwave dielectric properties of TiO2 doped with nano CuO were much better than that doped with micron CuO at the same doping content. Raman spectra showed that the full width at half maximum of Eg mode of TiO2 doped with micron CuO was larger than nano CuO doped ones, which indicated a poor crystalline and a short phonon lifetime. TiO2 doped with 1 wt.% nano CuO, sintered at 950°C for 2 h had compact and homogeneous microstructure and possessed the following dielectric properties: εr = 106, Q × f = 24808, τf = 371 ppm/°C.

Keywords

• Microstructure
• dielectric properties
• TiO2 ceramics
• nano CuO