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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >The dielectric behavior of a thermoelectric treated B2O3-Li2O-Nb2O5 glass
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The dielectric behavior of a thermoelectric treated B2O3-Li2O-Nb2O5 glass

机译：热电处理的B2O3-Li2O-Nb2O5玻璃的介电性能

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摘要

A transparent glass with the composition 60B(2)O(3)-30Li(2)O-10Nb(2)O(5) (mol%) was prepared by the melt-quenching technique. Glass-ceramics, containing LiNbO3 ferroelectric crystallites, were obtained by heat-treatment (HT) above 500 degrees C, with and without the presence of an external electric field. The dielectric properties of the glass and glass-ceramic were investigated, as a function of temperature (270-315K), in the 10 mHz-32 MHz frequency range. The presence of an external electric field, during the heating process, improves the formation of LiNbO3 crystallites. The rise of the treatment temperature and the applied field, during the heat-treatment, leads to a decrease in the dc electric conductivity (sigma(dc)), indicating a decrease of the charge carriers number. The dielectric permittivity (epsilon') values (300 K; 1 kHz) are between 16.25 and 18.83, with the exception of the 550 degrees C HT sample that presents a epsilon' value of 11.25. An electric equivalent circuit composed by an R in parallel with a CPE element was used to adjust the dielectric data. The results reflect the important role carried out by the heat-treatment and the electric field during the HT in the electric properties of glass-ceramics. (c) 2008 Elsevier B.V. All rights reserved.
机译：通过熔融淬火技术制备了具有60B（2）O（3）-30Li（2）O-10Nb（2）O（5）（mol％）组成的透明玻璃。含LiNbO3铁电微晶的玻璃陶瓷是通过在不存在和存在外部电场的情况下，在高于500摄氏度的温度下进行热处理（HT）而获得的。在10 mHz-32 MHz频率范围内，研究了玻璃和玻璃-陶瓷的介电性能随温度（270-315K）的变化。在加热过程中，外部电场的存在改善了LiNbO3晶体的形成。在热处理过程中，处理温度和施加电场的升高导致直流电导率（sigma（dc））降低，这表明电荷载流子数减少。介电常数（ε）值（300 K; 1 kHz）在16.25和18.83之间，除了550℃HT样品的ε值为11.25。由R与CPE元件并联组成的等效电路用于调节介电数据。结果反映了热处理和高温下的电场在微晶玻璃电性能中的重要作用。 （c）2008 Elsevier B.V.保留所有权利。

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