Effect of doped Mn on piezoelectric properties of (Na_0.5Bi_0.5)_0.92Ba_0.08TiO₃ lead-free ceramics

Abstract

Piezoelectric ceramics (Na_0.5Bi_0.5)_0.92Ba_0.08TiO₃+x%MnCO₃ (BNBT-Mn, x=0−1.6, mass fraction) were synthesized by conventional solid state reaction. The results show that when the addition of MnCO₃ is 0 – 1.4%, BNBT-Mn ceramics exhibit a single-phase perovskite structure. With the increase of content of MnCO₃, piezoelectric constant and electromechanical coupling factor increase rapidly when x is lower than 0.3. Then they both decrease when x is in the range of 0.3 and 1.6. When x=0.3, piezoelectric constant and electromechanical coupling factor reach the maximum value of 160 pC/N and 58.5% respectively, which can improve the temperature stability of BNBT-Mn.

Keywords

lead-free ceramics / Mn / piezoelectric properties

References

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