Abstract
Compositons in the pseudoquaternary system, 1-×(0.35Bi(Mg1/2Ti1/2)O3-0.30BiFeO3-0.35BiScO3)—×PbTiO3 were fabricated and characterised at the morphotropic phase boundary (MPB) between ferroelectric rhombohedral and tetragonal phases. The MPB occurred at × ≈ 0.48 at which composition the ferreoelectric to paraelectric phase transition, TC = 450°C, the piezoelectric constant, d33 = 328 pC/N and electromechanical coupling factor, kp = 0.44. The piezoelectric properties are viable for actuator applications but lower than equivalent high TC piezoelectrics such as 0.36BiScO3–0.64PbTiO3 (d33 = 450 pC/N, TC = 450°C). However, the relative reduction in the Sc2O3 content gives a significant cost saving which may prove a commercial advantage.
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The authors thank the Engineering and Physical Science Research Council (EP/E057616/1 and EP/G005001/1) for the funding.
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Sebastian, T., Sterianou, I., Sinclair, D.C. et al. High temperature piezoelectric ceramics in the Bi(Mg1/2Ti1/2)O3-BiFeO3-BiScO3-PbTiO3 system. J Electroceram 25, 130–134 (2010). https://doi.org/10.1007/s10832-010-9600-0
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DOI: https://doi.org/10.1007/s10832-010-9600-0