Effect of Ti-ion non-stoichiometry on microstructure and microwave dielectric characteristic of Li2ZnTi3O8 ceramics.

This paper studies the microwave dielectric properties, microstructure, vibration and densification of Li₂ZnTi_3+xO_8+2x (-0.04≤x≤+0.06<inline-graphic></inline-graphic>) 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 Li₂ZnTi_3.06O_8.12 composition is formed. The sintered samples were detected in the microwave frequency range by using the resonance technique. The τf<inline-graphic></inline-graphic> values of the ceramics within Ti excess adjusted to near zero. The Li₂ZnTi_2.96O_7.92 ceramic showed the best relative density, single phase and best microwave dielectric εr=25.98<inline-graphic></inline-graphic>, Q × f = 61,000 GHz, τf=-17.4ppm/∘C<inline-graphic></inline-graphic> sintered at 1100 °C for 4 h. [ABSTRACT FROM AUTHOR]