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Electrical and mechanical properties of MgO added 0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3 (BZT–0.5BCT) composite ceramics

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Abstract

MgO (0–2.0 vol%) added Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3 (BZT-0.5BCT) ceramics have been prepared by the conventional solid-state reaction method. The effects of MgO powder on the phase formation, densification, dielectric, piezoelectric and mechanical properties (flexural strength, hardness) of the BZT-0.5BCT ceramics have been studied systematically. The synthesized powder could be densified to 97 % of true density at a temperature of 1350 °C. The MgO addition also provided materials with better mechanical properties. The most interesting aspect of MgO added samples is their relative permittivity vs. temperature response. MgO additions effectively suppress the relative permittivity around phase transition temperature. The aging rate of d33 observed for BZT-0.5BCT is 14 %/decade. MgO addition reduces the ageing rate and for 1 vol% MgO added, BZT-0.5BCT shows aging rate of 3 %/decade. BZT-0.5BCT/MgO ceramics possesses good mechanical properties viz., flexural strength 93 MPa, which is almost 25 % higher than that of monolithic BZT-0.5BCT (73 MPa).

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Authors and Affiliations

  1. Department of Ceramic Engineering, National Institute of Technology, Rourkela, Odisha, 769008, India

    P. Adhikari, R. Mazumder & S. Abhinay

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  1. P. Adhikari
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  2. R. Mazumder
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  3. S. Abhinay
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Correspondence to R. Mazumder.

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Adhikari, P., Mazumder, R. & Abhinay, S. Electrical and mechanical properties of MgO added 0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3 (BZT–0.5BCT) composite ceramics. J Electroceram 37, 127–136 (2016). https://doi.org/10.1007/s10832-016-0049-7

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  • DOI: https://doi.org/10.1007/s10832-016-0049-7

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