Abstract
(Ba1-xBi0.67xK0.33x)(Ti1-xBi0.33xSn0.67x)O3 (BBKTBS) [x = 0.02, 0.04, 0.06, 0.08, 0.1 and 0.12] solid solutions ceramics were fabricated via a traditional solid phase reaction method. X-ray diffraction and Raman spectra confirmed that the ceramics transform from tetragonal phase (x ≤ 0.04) to pseudo-cubic phase (0.06 ≤ x ≤ 0.12). When x = 0.1, the ceramic exhibited the optimum dielectric properties with large relative permittivity εr(∼1850), low tanδ (<2%) in temperatures from 20 °C to 200 °C and good thermal stability Δε/ε25°C (≤± 15%) from −55 °C to 160 °C. The conductivity behavior of ceramic at high temperatures shown that the basic mechanisms of conduction and relaxation processes were thermal activation, and oxygen vacancies might be the ionic charge transport carriers.
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