Abstract
Abstract We report the study of the effects of processing parameters and additive concentration on the structure, microstructure and microwave dielectric properties of MTO–CeO 2 ( x wt.%) ceramics with x = 0, 0.5, 1.0 and 1.5 prepared by solid-state reaction method by adding CeO 2 nanoparticles as a sintering aid. The pure Mg 2 TiO 4 ceramics were not densifiable below 1450 °C. However, when CeO 2 nanoparticles were added to MTO, the densification achieved at 1300 °C along with the increase in average grain size with the uniform microstructure and improved microwave dielectric properties. This is mainly driven by the large surface energy of CeO 2 nanoparticles and their defect energy during the sintering process. While the addition of CeO 2 nanoparticles in MTO ceramics does not change the dielectric constant ( ɛ r ), the unloaded quality factor ( Q u ) was altered significantly. MTO–CeO 2 (1.5 wt.%) ceramics sintered at 1300 °C exhibit superior microwave dielectric properties ( ɛ r ∼ 14.6, Q × f 0 ∼ 167 THz), as compared to the pure Mg 2 TiO 4 ceramics. The observed results are correlated to the enhancement in density and the development of uniform microstructure with the enhanced grain size.
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