Abstract
This paper studies the microwave dielectric properties, microstructure, vibration and densification of Li2ZnTi3+xO8+2x ( $$- 0.04 \le {\text{x}} \le +0.06$$ ) ceramics, manufactured via a conventional mixed oxide route. The X-ray diffraction and Raman spectroscopy revealed the unit cell parameter and cation ordering in LZT non-stoichiometry in their vibrational modes. The densification and phase composition were characterized by the EDX and SEM methods. It was found that a slight Ti vacancy can improve the relative density to the maximum value (96.2%). The XRD results showed that the second phase of TiO2 in the Li2ZnTi3.06O8.12 composition is formed. The sintered samples were detected in the microwave frequency range by using the resonance technique. The $${\text{~}}{\tau _f}$$ values of the ceramics within Ti excess adjusted to near zero. The Li2ZnTi2.96O7.92 ceramic showed the best relative density, single phase and best microwave dielectric $${\varepsilon _r}~={\text{ }}25.98$$ , Q × f = 61,000 GHz, $${\tau _f}={\text{ }} - 17.4{\text{ ppm/}}^\circ {\text{C}}$$ sintered at 1100 °C for 4 h.
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