Abstract

The short-circuit current flow in crystals with the low-temperature phase transitions including Rochelle salt NaKC₄H₄O₆ · 4H₂O and triglycine sulfate (CH₂ · NH₂ · COOH)₃ · H₂SO₄ is investigated. The experiments are conducted on polar cut samples without preliminary polarization with the symmetric indium conducting coatings. The short-circuit currents remaining for a fairly a long time and the current decay with time are observed at room temperature on all the samples. The temperature dependences of the short-circuit currents in the temperature ranges of 16 to 45°С for Rochelle salt and 16–110°С for triglycine sulfate are obtained. The short-circuit currents are observed in these crystals both in the ferroelectric and paraphase. It is shown that, upon heating in the ferroelectric phase, the total short-circuit current is determined by competing processes: the pyroelectric currents and electrochemical decomposition currents. In the paraphase, the short-circuit currents are the electrochemical self-decomposition currents. Based on the experimental results obtained, it is demonstrated that the short-circuit current flow through the polar cut samples of Rochelle salt and triglycine sulfate crystals is induced by the intrinsic emf caused by the electrochemical self-decomposition of the opposite surfaces of the sample polar cuts when in contact with the conducting coatings due to the anisotropy of these surfaces. A model of the electrochemical self-decomposition in such crystals is proposed.

中文翻译：

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低温相变铁电晶体中表面电化学过程表现的特征

摘要

短路电流在具有低温相变的晶体中流动，包括罗谢尔盐NaKC ₄ H ₄ O ₆ ·4H ₂ O和硫酸三甘氨酸（CH ₂ ·NH ₂ ·COOH）₃ ·H ₂ SO ₄被调查。实验是在对称切割的无铟样品的极性切割样品上进行的。在室温下，在所有样品上都可以观察到相当长一段时间的短路电流，并且电流随时间衰减。对于罗谢尔盐，在16至45°С的温度范围内，对于硫酸三甘氨酸而言，短路电流的温度依赖性为16-110°С。在铁电体和同相中的这些晶体中都观察到短路电流。结果表明，在铁电相中加热时，总短路电流由竞争过程决定：热电电流和电化学分解电流。在同相中，短路电流是电化学自分解电流。根据获得的实验结果，表明通过Rochelle盐和三甘氨酸硫酸盐晶体的极性切割样品流过的短路电流是由样品极性相反表面的电化学自分解引起的固有电动势引起的。由于这些表面的各向异性，在与导电涂层接触时会产生切口。提出了这种晶体中电化学自分解的模型。结果表明，流过罗谢尔盐和硫酸三甘氨酸晶体极性切割样品的短路电流是由本征电动势引起的，该固有电动势是由样品极性切割的相反表面与导电体接触时的电化学自分解引起的。由于这些表面的各向异性而产生的涂层。提出了这种晶体中电化学自分解的模型。结果表明，流过罗谢尔盐和硫酸三甘氨酸晶体极性切割样品的短路电流是由本征电动势引起的，该固有电动势是由样品极性切割的相反表面与导电体接触时的电化学自分解引起的。由于这些表面的各向异性而产生的涂层。提出了这种晶体中电化学自分解的模型。