Fabrication of <110> grain-oriented 0.15BaTiO_3-0.85(Bi_(0.5)Na_(0.5))TiO_3 ceramics by a reactive templated grain growth method

摘要

< 110 > grain-oriented ceramics with the composition of 0.15BaTiO(3)-0.85(Bi0.5Na0.5)TiO3 with a high Curie temperature of similar to 300 degrees C were successfully fabricated by reactive templated grain growth of layered hydrogen titanate platelets with (Bi0.5Na0.5)TiO3 and BaCO3 matrix powders. A large degree of < 110 > orientation F-110 = 84% was achieved by decreasing green sheet thickness and application of pressure on a compact during sintering. As a consequence, improved remanent polarization was observed in these ceramics compared with randomly oriented ceramics, owing to easier polarization switching. A piezoelectric constant d(33) of 103 pC/N and an electromechanical coupling factor k(33) of 0.44 were obtained for the < 110 > grain-oriented ceramics. (C) 2017 The Japan Society of Applied Physics