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

ABSTRACT

The effect of simultaneous substitution of La³⁺ and Fe³⁺ ions on structural, dielectric, ferroelectric and piezoelectric properties of BaTiO₃ was studied. Polycrystalline ceramic samples with composition Ba_1-xLa_xTi_1-xFe_xO₃ 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 (<4%) was observed. The temperature coefficient of capacitance ‘T_cc’ 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.

KEYWORDS:

• BLTF
• dielectric
• ferroelectric
• piezoelectric

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors would like to thank Defence Research and Development Organization (DRDO), India for providing the research grant through Project No.: ERIP/ER/201612001/M/01/1698.