Abstract
A series of Li2ZnTi3-xO8 ceramics (0.04 ≤ x ≤ 0.16) were prepared by the conventional solid-state ceramic route. An obvious improvement in the order degree for the Li+ and Ti4+ ions in octahedral sites was achieved by deliberately introducing a slight Ti4+ non-stoichiometry. SAED, HRTEM, and Raman analysis confirmed a well-ordered B-site structure. Correspondingly, an obvious enhancement of the quality factor up to 108,000 GHz was demonstrated for Ti-deficient Li2ZnTi2.92O8 ceramics, a 50% increase compared to the stoichiometric counterpart. Moreover, the infrared reflectivity spectrum of the Li2ZnTi2.92O8 ceramic was used to disclose the intrinsic dielectric responses of a Li-based spinel for the first time. These results provide useful insights into the structure-property relation in the spinel material system.
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