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首页> 美国卫生研究院文献>Materials >The Effect of Acceptor and Donor Doping on Oxygen Vacancy Concentrations in Lead Zirconate Titanate (PZT)
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The Effect of Acceptor and Donor Doping on Oxygen Vacancy Concentrations in Lead Zirconate Titanate (PZT)

机译：受体和施主掺杂对锆钛酸铅（PZT）中氧空位浓度的影响

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摘要

The different properties of acceptor-doped (hard) and donor-doped (soft) lead zirconate titanate (PZT) ceramics are often attributed to different amounts of oxygen vacancies introduced by the dopant. Acceptor doping is believed to cause high oxygen vacancy concentrations, while donors are expected to strongly suppress their amount. In this study, La3+ donor-doped, Fe3+ acceptor-doped and La3+/Fe3+-co-doped PZT samples were investigated by oxygen tracer exchange and electrochemical impedance spectroscopy in order to analyse the effect of doping on oxygen vacancy concentrations. Relative changes in the tracer diffusion coefficients for different doping and quantitative relations between defect concentrations allowed estimates of oxygen vacancy concentrations. Donor doping does not completely suppress the formation of oxygen vacancies; rather, it concentrates them in the grain boundary region. Acceptor doping enhances the amount of oxygen vacancies but estimates suggest that bulk concentrations are still in the ppm range, even for 1% acceptor doping. Trapped holes might thus considerably contribute to the charge balancing of the acceptor dopants. This could also be of relevance in understanding the properties of hard and soft PZT.
机译：受体掺杂（硬）和施主掺杂（软）的锆钛酸铅（PZT）陶瓷的不同性能通常归因于掺杂剂引入的氧空位量不同。据信受主掺杂会导致高的氧空位浓度，而供体则有望强烈抑制其空位浓度。在这项研究中，La 3 + 掺杂了供体，Fe 3 + 掺杂了受体，La 3 + / Fe 3+ <通过氧示踪剂交换和电化学阻抗谱研究了共掺杂的PZT样品，以分析掺杂对氧空位浓度的影响。对于不同掺杂和缺陷浓度之间的定量关系，示踪剂扩散系数的相对变化允许估计氧空位浓度。施主掺杂不能完全抑制氧空位的形成。而是将它们集中在晶界区域。受主掺杂会增加氧空位的数量，但估计表明，即使对于1％的受主掺杂，总体浓度仍在ppm范围内。因此，陷孔可能大大有助于受体掺杂剂的电荷平衡。这也可能与了解硬质和软质PZT的性质有关。

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