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Polymorphic phase transition and morphotropic phase boundary in Ba1−x Ca x Ti1−y Zr y O3 ceramics

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This paper deals with Ca and Zr co-doped BaTiO3 (BCTZ(x, y)) (x = 0.1, 0.13, 0.2 and y = 0.05, 0.1, 0.15). These ceramics were prepared using the conventional solid state method. The symmetry, dielectric properties, Raman spectroscopy, ferroelectric behavior and piezoelectric effect were examined. X-ray diffraction (XRD) results display that morphotropic boundary occurs from tetragonal to orthorhombic region of BCZT(x=0.1, 0.2, y=0.05, 0.1) and polymorphic phase transitions from tetragonal to orthorhombic, orthorhombic to rhombohedral regions of BCZT(x=0.13, y=0.1). The evolution of the Raman spectra was investigated as a function of compositions at room temperature, in correlation with XRD analysis and dielectric measurements. We note that the substitution of Ca in Ba site and Zr ions in Ti site slightly decreased the cubic-tetragonal temperature transition (T C) and increased the orthorhombic–tetragonal (T 1) and rhombohedral–orthorhombic (T 2) temperatures transitions. The ferroelectric properties were examined by a P–E hysteresis loop. The two parameters ΔT 1 and ΔT 2 are defined as ΔT 1 = T C − T 1 and ΔT 2 = T C − T 2, they come close to T C for x = 0.13, y = 0.1, which reveals that this composition is around the polymorphic phase. The excellent piezoelectric coefficient of d 33 = 288 pC N−1, the electromechanical coupling factor k p = 40%, high constant dielectric 9105, coercive field E c = 0.32 (KV mm−1) and remanent polarization P r = 0.1 (µc mm−2) were obtained for composition x = 0.13, y = 0.1.

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Authors and Affiliations

  1. Laboratoire des Matériaux Multifonctionnels et Applications (LaMMA) (LR16ES18), Université de Sfax, Faculté des Sciences de Sfax (FSS), B.P.1171, 3018, Sfax, Tunisia

    M. Ben Abdessalem, S. Aydi, A. Aydi, N. Abdelmoula & H. Khemakhem

  2. Laboratoire de Génie Electrique et Ferroélectricité (LGEF) de L’INSA de Lyon, Lyon, France

    Z. Sassi

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  1. M. Ben Abdessalem
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Abdessalem, M.B., Aydi, S., Aydi, A. et al. Polymorphic phase transition and morphotropic phase boundary in Ba1−x Ca x Ti1−y Zr y O3 ceramics. Appl. Phys. A 123, 583 (2017). https://doi.org/10.1007/s00339-017-1196-7

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