Effects of Ba(Ti_0.90Sn_0.10)O₃ on Electrical Properties of Bi_0.5Na_0.5TiO₃-0.06BaTiO₃ Lead-Free Piezoelectric Ceramic System

Abstract

Lead-free piezoelectric ceramics with the composition of (1-x)[Bi_0.5Na_0.5TiO₃-0.06BaTiO₃]-xBa(Ti_0.90Sn_0.10)O₃ or (1-x)[BNT-0.06BT]-xBTS ternary system (where x = 0, 0.01, 0.02, 0.03, 0.04 and 0.05 mol fraction) have been synthesized by a conventional mixed-oxide method. The optimum sintering condition for all samples was found to be 1125 °C/2 h with a heating/cooling rate of 5 °C/min. The relative densities of all samples were ∼98% with the accompanying linear shrinkage of ∼18%. The XRD patterns of all samples showed no detected impurity phase. It was found that the composition of x = 0.03 exhibited optimum electrical properties (ε_r = 1895, tan δ = 0.0355 and d₃₃ = 255 pC/N at room temperature), suggesting that this composition had potential to be a promising lead-free piezoelectric candidate compound for dielectric and piezoelectric applications.

Keywords:

• Lead free piezoelectrics
• ferroelectric
• bismuth sodium titanate
• barium titanate

Additional information

Funding

This research was financially supported by Thailand Science Research and Innovation (TSRI). Partial support from the Center of Excellence in Materials Science and Technology, Department of Physics and Materials Science, Faculty of Science, Chiang Mai University and Office of Research Administration, Chiang Mai University are also acknowledged.