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The effect of simultaneous substitution of La 3+  and Fe 3+  ions on structural, dielectric, ferroelectric and piezoelectric properties of BaTiO 3  was studied. Polycrystalline ceramic samples with composition Ba 1- xLaxTi 1- xFexO 3  with  x  = 0, 0.005, 0.015 and 0.020 were prepared by the solid-state route and sintered at 1325°C. X-ray diffraction (XRD) analysis confirmed the single phase with tetragonal perovskite structure in all the prepared ceramics. Dielectric constant ‘ ϵ ’ and tangent loss ‘tanδ’ was measured as a function of temperature (25–200°C). The value of  ϵ  increases with an increase in La and Fe contents. A very small value of tanδ (&lt;4%) was observed. The temperature coefficient of capacitance ‘ Tcc ’ was found to be around 10% for all the samples. PE hysteresis loops were recorded at room temperature for all samples. The maximum value of  ϵ  and piezoelectric coefficient ‘ d33 ’ was found to be 3735 (at 30°C, 100 kHz) and 140pC/N, respectively for  x  = 0.020.

Structural, dielectric, ferroelectric and piezoelectric properties of La and Fe substituted barium titanate ceramics