Crystal structure and optimized microwave dielectric properties of (1 − x) LiZn0.5Ti1.5O4–xTiO2 ceramics for application in dielectric resonator

Microwave dielectric ceramics with the composition of (1-x) LiZn 0.5Ti1.5O4 (LZT)-xTiO2 (0.05 ≤ x ≤ 0.4) were prepared by a solid-state reaction route. XRD patterns revealed that the samples consist of LiZn0.5Ti1.5O4 and rutile TiO2, and the amount of rutile TiO2 phase increased with increasing the x values. The microwave measurements show that the dielectric properties of ceramics can be improved with increasing x values. When x = 0.1, the temperature coefficient of resonant frequency (τf ) of 0.9LZT-0.1TiO2 ceramic can be adjusted to a near-zero value of -1 ppm/ C, and permittivity (εr) and Q × f value are 26 and 45,000 GHz, respectively. These results indicate that 0.9LZT-0.1TiO2 ceramic can be a candidate in microwave dielectric resonators. © 2013 Springer Science+Business Media New York.