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LaAlO 3 –BaSnO 3  ceramics as a new microwave dielectric material were investigated in terms of optimum synthesis conditions and thereby the relative density, microstructure, solid-solution state, and dielectric properties with the addition of various sintering aids at different sintering temperatures. The dielectric properties of 0.9LaAlO 3 –0.1BaSnO 3  (LA-0.1BS) were strongly influenced by relative density, microstructure, chemical ordering, and mixing rule of the dielectric constant. Densification of the LA-0.1BS ceramics was improved from 82.3 to 96.13% with an average grain size of around 1.9 µm at reduced sintering temperature by 250°C. The LA-0.1BS ceramics sintered with 3 mol% of Bi 2 O 3 –SiO 2  (BS) showed dielectric constant (ϵ r ) ∼21.18 with associated dielectric loss (tan δ) ∼0.00824 and  Q  ×  f  ∼1213.59 (10 GHz) which could be achieved at low sintering temperature of 1400–1450°C.

Low temperature sintering and dielectric properties of LaAlO 3 –BaSnO 3 -based microwave dielectrics