The TiO_(2) 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 TiO_(2) ceramics ...The TiO_(2) 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 TiO_(2) ceramics doped with nano CuO have been investi-gated.Nano CuO with higher sintering capability worked as flux former and effectively improved the sintering process of TiO_(2) ceramics.The microwave dielectric properties of TiO_(2) 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 E_(g) mode of TiO_(2) doped with micron CuO was larger than nano CuO doped ones,which indicated a poor crystalline and a short phonon lifetime.TiO_(2) doped with 1wt.% nano CuO,sintered at 950℃ for 2h had compact and homogeneous microstructure and possessed the following dielectric properties:ε_(r)=106,Q×f=24808,τf=371ppm/℃.展开更多
基金The authors acknowledge the financial support of the Science and Technology projects of Guangdong Province(2011A091103002).
文摘The TiO_(2) 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 TiO_(2) ceramics doped with nano CuO have been investi-gated.Nano CuO with higher sintering capability worked as flux former and effectively improved the sintering process of TiO_(2) ceramics.The microwave dielectric properties of TiO_(2) 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 E_(g) mode of TiO_(2) doped with micron CuO was larger than nano CuO doped ones,which indicated a poor crystalline and a short phonon lifetime.TiO_(2) doped with 1wt.% nano CuO,sintered at 950℃ for 2h had compact and homogeneous microstructure and possessed the following dielectric properties:ε_(r)=106,Q×f=24808,τf=371ppm/℃.
