Abstract
Lead-free ceramic samples Ba0.95Ca0.05(Ti0.95Zr0.05)1−x(Zn1/3Nb2/3)xO3 (BCZTxZN, 0 < x < 0.020) were successfully prepared by the conventional solid-state reaction method. The Morphotropic phase boundary (MPB) region, from the tetragonal to orthorhombic symmetry (O-T) at room temperature (RT), was identified of all samples by X-ray diffraction analysis (XRD). The Raman spectra confirmed the XRD result. The temperature dependency of dielectric constant displays a classic ferroelectric behavior with a diffuse phase character in the frequency range 1 kHz to 50 kHz. The maximum of permittivity changed with the introduced of Zn2+ and Nb5+ in the matrix of BCZT ceramic. The optimal ferroelectric properties were Pr = 5.89 μC/cm2 and Ec = 4.82 kV/cm in the BCZT10ZN material. Besides, this sample exhibited energy storage density properties at RT (Wrec = 66.69 mJ/cm3 and η = 37%). Furthermore, an electrocaloric effect (ΔT = 0.33 K at 30 kV/cm) was determined using an indirect method near the RT for the sample x = 0.020.
Published Version
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