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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Enhancement of Qm by co-doping of Li and Cu to potassium sodium niobate lead-free ceramics
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Enhancement of Qm by co-doping of Li and Cu to potassium sodium niobate lead-free ceramics

机译：通过将Li和Cu共掺杂到铌酸钾钠无铅陶瓷中来提高Qm

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摘要

Lead-free piezoelectric ceramics KNN modified by Li-substitution and CuO addition have been synthesized, and the piezoelectric and dielectric properties were measured. A morphotropic phase boundary (MPB) between orthorhombic and tetragonal phases was formed with Li-substitution. The co-doping of Li and Cu markedly enhanced the mechanical quality factor (Qm) in comparison with the sole doping of Li and Cu. Anomalous anti-ferroelectric-like hysteresis curves were observed in 2 mol% CuO-doped ceramics. The anti-ferroelectric-like curves were changed to that of normal ferroelectrics following poling. A model based on the formation of the internal bias field (Ei) due to the movements of space charges was proposed to explain these phenomena. It was considered that the Ei stabilized the spontaneous polarization (Pa) and suppressed the domain wall motion to enhance the Qm. The highest Qm obtained in this study was 742. The [(Na0.5K0.5)0.96Li0.04] NbO3 + 0.45 mol% CuO ceramics showed a high Qm value of 414 with a high piezoelectric constant d33 of 100 pC/N.
机译：合成了通过Li取代和CuO添加改性的无铅压电陶瓷KNN，并测量了压电性能和介电性能。正交晶相和四方晶相之间的变质相边界（MPB）被Li取代。与仅掺杂Li和Cu相比，Li和Cu的共掺杂显着提高了机械品质因数（Qm）。在掺杂2 mol％CuO的陶瓷中观察到反铁电样的异常磁滞曲线。极化后，类似铁电体的曲线变为普通铁电体的曲线。提出了一个基于由于空间电荷运动而形成的内部偏置场（Ei）的模型来解释这些现象。认为Ei稳定了自发极化（Pa）并抑制了畴壁运动以提高Qm。在这项研究中获得的最高Qm为742。[（Na0.5K0.5）0.96Li0.04] NbO3 + 0.45 mol％CuO陶瓷的Qm值为414，压电常数d33为100 pC / N。

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