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首页> 外文期刊>Journal of advanced dielectrics >F-center mechanism of long-term relaxation in lead zirconate-titanate-based piezoelectric ceramics. 1. After-heating relaxation
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F-center mechanism of long-term relaxation in lead zirconate-titanate-based piezoelectric ceramics. 1. After-heating relaxation

机译：锆钛酸铅基压电陶瓷长期弛豫的F中心机理。 1.加热后放松

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摘要

Results of experimental investigation of relaxation aging processes in Pb(Zr,Ti)O_3-based solid solutions after termination of external actions are presented. Heating, DC electric field, uniaxial pressure and some of their combinations were taken as external actions. In the main part of the present paper, we use heating as external action. The said processes are long-time one and are described by the logarithmic function of time. Reversible and nonreversible relaxation processes take place depending on the action intensity. The relaxation rate depends on the action intensity also, and the said dependence has nonlinear and nonmonotonic form if external action leads to domain disordering. The oxygen vacancies-based model for description of the long-time relaxation processes is suggested. The model takes into account oxygen vacancies on the sample's surface ends, their conversion into F~+- and F~0-centers under external effects (due to the liberation of the pyroelectric charge) and subsequent relaxation of these centers into the simple oxygen vacancies after the actions termination. The initial sample's state is electroneutrality one. F-center formation leads to the violation of the original sample's electroneutrality, and generates DC electric field into the sample. Relaxation of F-centers is accompanied by decreasing of electric field, induced by them, and dielectric constant relaxation as consequent effect.
机译：给出了外部作用终止后基于Pb（Zr，Ti）O_3的固溶体中弛豫老化过程的实验研究结果。加热，直流电场，单轴压力及其某些组合被视为外部作用。在本文的主要部分，我们将加热作为外部作用。所述过程是长时间的，并且通过时间的对数函数来描述。可逆和不可逆松弛过程的发生取决于动作强度。弛豫速率也取决于作用强度，并且如果外部作用导致域混乱，则所述依赖性具有非线性和非单调形式。建议使用基于氧空位的模型来描述长时间的松弛过程。该模型考虑了样品表面末端的氧空位，在外部作用下（由于热释电的释放）它们转换为F〜+-和F〜0-中心以及随后将这些中心松弛为简单的氧空位的原因。动作终止后。初始样品的状态为电中性。 F中心的形成导致违反原始样品的电子中性，并在样品中产生DC电场。 F中心的弛豫伴随着电场的降低（由它们引起）和介电常数弛豫（其结果）。

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