Effect of contact phenomena on the electrical conductivity of reduced lithium niobate

A. Shportenko, A. Kislyuk, A. Turutin, I. Kubasov, M. Malinkovich, Y. Parkhomenko
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引用次数: 2

Abstract

Lithium niobate is a ferroelectric material finding a wide range of applications in optical and acoustic engineering. Annealing of lithium niobate crystals in an oxygen-free environment leads to appearance of black coloration and concomitant increasing electrical conductivity due to chemical reduction. There are plenty of literary data on the electrophysical properties of reduced lithium niobate crystals though contact phenomena occurring during electrical conductivity measurement as well as issues of interaction between the electrode material and the test specimens are almost disregarded. The effect of chromium and indium tin oxide electrodes on the results of measurements of electrophysical parameters at room temperature for lithium niobate specimens reduced at 1100 °C has been investigated. It was found that significant nonlinearities in the VACs of the specimens at below 5 V distort the specific resistivity readings for lithium niobate. This requires measurements at higher voltages. Impedance spectroscopy studies have shown that the measurement results are largely affected by capacities including those probably induced near the contacts. It has been shown that the experimental results are described adequately well by a model implying the presence of near-contact capacities that are parallel to the specimen’s own capacity. Possible mechanism of the induction of these capacities has been described and a hypothesis has been proposed of the high density of electron states at the electrode/specimen interface that can trap carriers, the concentration of trapped carriers growing with an increase in annealing duration.
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Effect接触现象对还原铌酸锂电导率的影响
铌酸锂是一种铁电材料,在光学和声学工程中有着广泛的应用。铌酸锂晶体在无氧环境下的退火导致黑色的外观和伴随的由于化学还原而增加的电导率。关于还原铌酸锂晶体电物理性质的文献数据很多,但在电导率测量过程中出现的接触现象以及电极材料与试样之间的相互作用问题几乎被忽略。研究了氧化铬和氧化铟锡电极对1100℃还原铌酸锂试样室温电物理参数测量结果的影响。结果表明,在低于5 V的电压下,试样的电流值存在明显的非线性,使铌酸锂的比电阻率读数失真。这需要在更高的电压下进行测量。阻抗谱研究表明,测量结果在很大程度上受电容的影响,包括触点附近可能产生的电容。它已经表明,实验结果是充分描述了一个模型,暗示近接触能力的存在,平行于试样本身的能力。本文描述了诱导这些能力的可能机制,并提出了电极/试样界面处可以捕获载流子的高密度电子态的假设,被捕获载流子的浓度随着退火时间的增加而增加。
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CiteScore
0.60
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