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PbZrO3-PbTiO3系压电陶瓷极化效应的正电子湮没研究

何元金 李龙土

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PbZrO3-PbTiO3系压电陶瓷极化效应的正电子湮没研究

何元金, 李龙土

POSITRON ANNIHILATION STUDY OF ELECTRIC POLARIZA-TION EFFECT IN PIEZOELECTRIC CERAMICS OF PbZrO3-PbTiO3 SYSTEM

He Yuan-jin, Li Long-tu
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  • 用正电子寿命测量方法研究了锆钛酸铅(简称PZT)压电陶瓷的电场极化效应。发现正电子平均寿命τm随极化场强E的提高而增大。讨论了τm增大的微观机制,这可能主要归因于内电场增大在能量上有利于正电子形成qPs态。同时进行了介电常数、机电耦合系数、压电常数等的测量,并与正电子寿命测量的结果作了对比,认为将正电子作为测量电畴转向程度及电子能量状态变化的一种手段是可能的。正电子寿命测量采用了特殊的单样品法,并就与此有关的数据处理和分析方法进行了若干讨论。
    The electric polarization effect in piezoelectric ceramics of PbZrO3-PbTiO3 system (PZT) was examined by positron lifetime measurements. It was found that the mean lifetime τm increases with the increase of the electric field E. The micromechanism of the increase of τm was discussed, it may be mainly attributed to that the increase of the inner electric field would be energetically in favour of the positrons to form in qPs state. The measurements of the coupling factor K_p, the piezoelectric constant d33, and the dielectric constant ε33T/ε0 were also carried out and the results were compared with that of positron lifetime measurements. It is suggested that there is a possibility to take positrons as a tool for studying the extent of the domain turning and the changes of the energe situation of the electrons during the polarization.A special single sample method was used in the present work. Finally, our method of date analyzing was discussed.
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  • 文章访问数:  6770
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  • 被引次数: 0
出版历程
  • 收稿日期:  1982-05-10
  • 刊出日期:  1983-03-05

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