High Temperature Electromechanical Coupling Conversion And Piezoelectric Charge Constant In (Na_0.5Bi_0.5)(NdxTi_(1-2x)Nb_x)O₃ Piezoelectric Ceramics

Syed Mahboob¹*, Rizwana²

¹Department of Physics, Osmania University, Hyderabad-500007, Telangana, (INDIA)
²Institute of Aeronautical Engineering, Dundigal, Hyderabad-500043, Telangana, (INDIA)

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ABSTRACT – DOI: https://dx.doi.org/10.47204/EMSR.6.2.2024.115-121

(Na_0.5Bi_0.5)(NdxTi_(1-2x)Nb_x)O₃ ceramics were prepared by solid-state synthesis. Impedance/modulus measurements were carried out over a wide range of frequency (1KHz-1MHz) and at constant temperature (848-898K) using AUTOLAB PGSTAT 30 low frequency impedance analyzer. The values of activation energy are 1.975 eV, 1.881 eV & 2.232 eV for x = 0.0125, 0.025 & 0.05 respectively. These activation energies are attributed to the different type of defects present in the sample for example oxygen vacancies, A site and Ti vacancies. The value of d₃₃ are 37.68 nm.V^-1, 16.81 nm.V^-1 & 13.55 nm.V^-1 at 848K, 873K & 898K respectively for x = 0.0125. The value of d₃₃ are 29.52 nm.V^-1, 37.99 nm.V^-1 & 17.16 nm.V^-1 at 848K, 873K & 898K respectively for x = 0.025. The value of d₃₃ are 23.05 nm.V^-1, 18.89 nm.V^-1 & 10.62 nm.V^-1 at 848K, 873K & 898K respectively for x = 0.05. The higher values of d₃₃ are attributed to higher operating temperatures. The higher values of d₃₃ are also attributed to unknown but constant applied stress due to use of zig for electromechanical studies.