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Lead-free (Ba_0.85Ca_0.15)[(Zr_0.1Ti_0.9)]O₃ (BCZT) piezoceramics were synthesized using solid-state ceramic processing. In order to improve the electrical properties CeO₂ and CuO additives/dopants were used and two methods were employed to introduce theses oxides; one, in which 0.1 mol.% CeO₂ was mixed with the raw materials and the composition was balanced for A-site substitution (BCCe_0.1ZT) and the other where CuO (0.1mol%) was added to the raw materials in the same manner (BCCu_0.1ZT) before calcination. After calcination at 1250 °C, sintering additives of CuO and CeO₂ (0.04 wt.%) were added to the synthesized powders. The latter was added to BCCu_0.1ZT to produce BCCu_0.1ZT+0.04Ce and the former was used for BCCe_0.1ZT powder to make BCCe_0.1ZT+0.04Cu composition. These four samples together with pure BCZT were sintered at 1350°C for 4 h. The microstructure and phase composition were investigated by scanning electron microscopy and X-ray diffraction. Polarization and strain measurements were done using a modified Sawyer-Tower circuit and an optical displacement sensor and temperature and frequency dependence of dielectric permittivity were measured using an impedance analyzer. Our results revealed that BCCuZT+ 0.04 CeO₂ sample had the best dielectric properties of ɛ_r=3585, P_r=15 μC/cm², S_max=0.047, and d₃₃*=967 pm/V, which was better than pure BCZT at this temperature. Accordingly, these ceramics can be regarded as good candidates to replace previous dielectric materials.

Keywords: Lead free BCZT, CeO2, CuO, dielectric, ferroelectric.

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