Effect of BFCO Doping on Phase Structure, Microstructure, Electric and Magnetic Properties of BNKLT Ceramics Prepared by the Combustion Method

Abstract

Lead free solid solution Bi_0.5(Na_0.68K_0.22Li_0.10)_0.5TiO₃-xmol%Bi₂FeCrO₆ (BNKLT-xBFCO), with x = 0, 0.004, 0.007, 0.013 and 0.019, ceramics were calcined at 750 °C and sintered at 1150 °C for 2 h using the solid state combustion technique. The effect of the x content on the phase formation, microstructure, electric and magnetic properties of the produced ceramics were investigated. All samples exhibited a pure perovskite phase with the co-existence of rhombohedral and tetragonal phases. The doping of BFCO enhanced the density and dielectric properties of the BNKLT ceramics. The BNKLT-0.013BFCO ceramics showed the highest density (5.87 g/cm³), excellent dielectric properties (ε_R∼1390, tan δ_R∼0.039, ε_m ∼4986 and tan δ_m∼0.075) and the highest piezoelectric constant (d₃₃∼194 pC/N). The sample with x = 0 showed diamagnetic behavior, while the samples with 0.004-0.019 content exhibited paramagnetic behavior with higher magnetization at higher x content.

Keywords:

• BNKLT
• dielectric properties
• magnetic
• combustion technique

Acknowledgements

Thank are also given to Asst. Prof. Dr. Kyle V. Lopin for his help in editing the manuscript.

Additional information

Funding

This work was financially supported by the Department of Physics, Faculty of Science, Naresuan University.