Crystal structure and microwave dielectric properties of LiNb0.6Ti0.5O3 ceramics with Zn and Nb co-doped

The phase composition, microstructure, and microwave dielectric properties of the (Zn1/3Nb2/3)(4+) substitution of Ti4+ in LiNb0.6Ti0.5O3 ceramics were systematically studied. The XRD pattern analysis results confirmed that Li1.075Nb0.625Ti0.45O3 solid solution single phase was formed in all components. Raman spectroscopy analysis showed that the substitution of (Zn1/3Nb2/3)(4+) caused the expansion of the titanium oxide octahedral framework, and the increase in dielectric constant (epsilon(r)) was attributed to the increase in bulk density and cation polarizability. The increase of oxygen vacancies after high-temperature sintering of doped ions has a negative impact on the quality factor (Q x f) value. As the doping content increases, the value of tau(f) can continuously move to close to zero. TiNb0.6Ti((0.5-x))Zn1/3Nb2/3)(x)O-3 ceramic (x = 0.06) has good microwave dielectric properties when sintered at 1025 degrees C for 2 h: epsilon(r) = 72.1, Q x f = 5370 GHz (at 4 GHz), tau(f) = 3.52 ppm /degrees C.

Automated summary

The phase composition, microstructure, and microwave dielectric properties of (Zn1/3Nb2/3)(4+) substitution in LiNb0.6Ti0.5O3 ceramics were studied. The substitution caused the expansion of the titanium oxide octahedral framework and increased the dielectric constant. However, the high-temperature sintering of doped ions increased oxygen vacancies and negatively affected the quality factor.