Abstract
Preparation of a[0.93(Bi0.5Na0.5)TiO3-0.07BaTiO3]-(1-a)[0.8(Bi0.5Na0.5)TiO3-0.2(Bi0.5K0.5)TiO3] ceramics; BNBK-a (0.2≤a≤ 0.8), focusing on the morphotropic phase boundary (MPB) between the rhombohedral and tetragonal phases, was investigated. BNBK-a powders with 0.2≤a≤0.8 were successfully fabricated using the combustion technique. BNBK-a samples with 0.2≤a≤ 0.8 were sintered between1050-1200°C for 2 h. The effects of sintering temperature and a changing on the phase formation, microstructure and dielectric properties of perovskite BNBK-a ceramics were studied. XRD results of BNBK-a ceramics with 0.2≤a≤0.8 showed the MPB. The increasing of a content affected an increased tetragonal phase in the BNBK ceramics. The SEM results showed the average grain size of the BNBK-a samples with 0.2≤a≤ 0.8 increased with the increase of sintering temperatures. The effect of the a content had no influence on the trend of grain sizes. The maximum density, shrinkage and dielectric constant (ϵr) at Curie temperature (Tc) of BNBK-0.2, BNBK-0.4, BNBK-0.6 and BNBK-0.8 ceramics were found from the samples sintered at 1150, 1150, 1175 and 1175°C, respectively. Of all the different compositions, BNBK-0.8 ceramics exhibited the highest density (∼5.78 g/cm3), dielectric constant at Tc (5890), remanent polarization (19.6 μC/cm2) and piezoelectric constant (178 pC/N).
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