ABSTRACT

Herein, Pb_0.95Ba_0.01Sr_0.04(Zr_0.53Ti_0.47)O₃ piezoelectric ceramics comprising 0.25 wt% MnCO₃, 1 wt% LiBiO₂ and 0.06 wt% CuO (PBSZT-LBCu-Mn ceramics, abbreviated as Mn0.25) were prepared via a conventional method at a low firing temperature of ∼900 °C. The phase structure and temperature-dependent electrical properties were systematically investigated. The product composition possesses the following properties: normalised strain (d₃₃*) ∼362 pm/V, Curie temperature (T_c) ∼336 °C, mechanical quality factor (Q_m) ∼568, loss factor (tan δ) ∼0.0058 and relative dielectric constant (ϵ_r) ∼872. The remnant polarisation (P_r), maximum polarisation (P_max) and coercive field (E_c) slightly decreased as a function of increasing temperature, while the strain (S_pol) was observed to increase. Additionally, d₃₃* values of 362 and 411 pm/V were achieved at 25 °C and 120 °C, respectively, with a change ratio <14%. The Mn0.25 ceramics exhibit low ϵ_r and tan δ values, leading to small average power dissipation, which is beneficial for high-frequency actuator applications.

摘要

在此，包含0.25 wt% MnCO ₃、1 wt% LiBiO ₂和0.06 wt% CuO的Pb _0.95 Ba _0.01 Sr _0.04 (Zr _0.53 Ti _0.47 )O ₃压电陶瓷（PBSZT-LBCu-Mn陶瓷，缩写为Mn0.25）通过常规方法在约 900°C 的低烧制温度下制备。系统地研究了相结构和温度相关的电性能。产品组成具有以下特性：归一化应变 ( d ₃₃ *) ∼362 pm/V, 居里温度 ( T _c ) ∼336 °C, 机械品质因数 ( Q _m) ~568, 损耗因子 (tan δ ) ~0.0058 和相对介电常数 ( ϵ _r ) ~872。残余极化 ( P _r )、最大极化 ( P _max ) 和矫顽场 ( E _c ) 随温度升高而略有下降，而应变 ( S _pol ) 则有所增加。此外，d ₃₃ * 值分别在 25 °C 和 120 °C 下达到 362 和 411 pm/V，变化率 <14%。Mn0.25 陶瓷表现出低ϵ _r和 tan δ 值，导致较小的平均功耗，这有利于高频执行器应用。