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

来源期刊：中南大学学报(英文版)2005年第3期

论文作者：周小元 顾豪爽 李位勇

文章页码：266 - 268

Key words：lead-free ceramics;Mn;piezolelctric properties

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 whenxis lower than 0.3. Then they both decrease whenxis in the range of 0.3 and 1.6. Whenx=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.