Abstract
(Bi0.5Na0.5)TiO3 doped with 8 mol% BaTiO3 (BNT–BT0.08) powder was prepared by an acetate–alkoxide sol–gel method. The evolution of the structure and microstructure of the precursor gel, heated at various temperatures as well as, the piezoelectric and ferroelectric properties of BNT–BT0.08 ceramics were studied. Nanopowder of BNT–BT0.08 with average particles size of 30 nm and, crystallized on the perovskitic structure of (Bi0.5Na0.5)TiO3, were obtained from the precursor gel by heating at 600 °C, 3 h in air. The ceramics of composition 0.92(Bi0.5Na10.5)TiO3–0.08BaTiO3, manufactured from the as-prepared nanostructured powder, present good dielectric properties (ɛr,max = 4000–4500, tan δ = 0.02–0.03) and high mechanical quality factor (Qm ∼ 500).
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