Open AccessThe microstructure and dielectric properties of titanium oxide doped with nano CuO
Author(s) -
Juan Li,
Renli Fu,
Yue Xu,
Zhenxiao Fu,
SU Hongjuan
Publication year - 2014
Publication title -
journal of advanced dielectrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.38
H-Index - 13
eISSN - 2010-135X
pISSN - 2010-1368
DOI - 10.1142/s2010135x14500258
Subject(s) - materials science , microstructure , doping , dielectric , ceramic , raman spectroscopy , sintering , nano , analytical chemistry (journal) , composite material , optoelectronics , optics , physics , chemistry , chromatography
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 investigated. 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 1 wt.% nano CuO , sintered at 950°C for 2 h had compact and homogeneous microstructure and possessed the following dielectric properties: ε r = 106, Q × f = 24808, τ f = 371 ppm/°C.