Low temperature sintering and microwave dielectric properties of Li_2O-3ZnO-5TiO_2 ceramics doped with V_2O_5

摘要

Novel low-temperature sinterable Li~(2)O–3ZnO–5TiO~(2)(LZT135) ceramics were prepared through a solid-state reaction method. XRD and EDS results showed that the LZT135 ceramics formed solid solutions with a crystal structure similar to Zn~(2)Ti~(3)O~(8). The addition of V~(2)O~(5)could decrease the sintering temperature of LZT135 ceramics to about 900 °C. When 0.6 wt% V~(2)O~(5)was added, the LZT135 ceramics exhibited dielectric properties with relative permittivity (ε~(r)) = 20.2, quality factor (Q×f) = 59,000 GHz, and temperature coefficient of resonant frequency (τ~(f)) = − 30.2 ppm/°C at a sintering temperature of 900 °C. However, the τ~(f)value was still too high for industrial applications; therefore, TiO~(2)was added to the LZT135 ceramics to further adjust the τ~(f)value. Finally, near-zero τ~(f)values and simultaneously desirable Q×f values were maintained for the low-temperature sintered LZT135 ceramics. The LZT135 ceramics doped with 0.6 wt% V~(2)O~(5)and 6 wt% TiO~(2)exhibited reasonably good microwave dielectric properties with ε~(r) = 24.3, Q×f = 51,700 GHz, and τ~(f) = 0.3 ppm/°C when sintered at 900 °C, thus showing a great potential for low-temperature co-firing ceramic applications.