Abstract
Na0.4K0.1Bi0.5TiO3 (NKBT) solid solution was synthesized by the conventional solid-state route. X-ray diffraction pattern of poled NKBT ceramic was refined by the Rietveld technique to determine the structural phases (Rhombohedral and Tetragonal) present in the solid solution. High density (98% of theoretical density) ceramics exhibited an average grain size of 1.2 μm from the SEM analysis. EDS spectra and elemental mapping were recorded to confirm the formation of exact stoichiometric composition in the prepared ceramic. The hardness of the NKBT ceramic was measured by nano-indentation and Vickers microhardness techniques. Young's modulus was measured by nano-indentation, ultrasonic echo pulse tester, compression tests and compared. The effect of mechanical stress on piezoelectric properties of pre-poled NKBT ceramic was studied at room temperature. Fracture toughness (1.45 MPa m1/2) and compressive strength (250 MPa) of the ceramic were determined to ensure its candidature for actuator application from a mechanical perspective. The phenomena of mechanical depolarization were explained through the domain rotation concept.
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