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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 >Study of CaO-WO3-P2O5 glass system by dielectric properties, IR spectra and differential thermal analysis
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Study of CaO-WO3-P2O5 glass system by dielectric properties, IR spectra and differential thermal analysis

机译：CaO-WO3-P2O5玻璃体系的介电性能，红外光谱和差热分析研究

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摘要

Dielectric constant epsilon(1), loss tan delta and ac conductivity delta(ac) of 40CaO-xWO(3)-(60 - x)P2O5 (with 0 less than or equal to x less than or equal to 15) glasses are studied over a range of frequencies and temperature. The dielectric breakdown strength of these glasses is also determined at room temperature. The values of dielectric parameters, viz., epsilon', tan delta and sigma(ac) of CaO-P2O5 glasses are found to decrease with the introduction of WO3 up to 3 mol% and increase with further increase in the concentration of WO3; the probable reasons for such an increase are identified and explained with the aid of IR spectra and differential thermal analysis of these glasses. The variation of tan delta with temperature at different frequencies of CaO-P2O5 glasses has exhibited dielectric relaxation effects with decreasing relaxation intensity with increase in the concentration Of WO3 from 0 to 3 mol%, such relaxation effects seem to have been absent in glasses containing WO3 beyond 3 mol%. The relaxation phenomenon has been analysed by a pseudo-Cole-Cole plot method and the possible mechanism responsible for such relaxation effects has been suggested. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 51]
机译：研究了40CaO-xWO（3）-（60-x）P2O5（0小于或等于x小于或等于15）玻璃的介电常数epsilon（1），损耗tanδ和ac电导率delta（ac）在一定范围的频率和温度范围内。这些玻璃的介电击穿强度也在室温下确定。发现当引入最多3 mol％的WO3时，CaO-P2O5玻璃的介电参数值即epsilon，tanδ和σ（ac）降低，而随着WO3浓度的进一步增加而增加;借助这些玻璃的红外光谱和差热分析，确定并解释了这种增加的可能原因。在CaO-P2O5玻璃的不同频率下，tanδ随温度的变化表现出介电弛豫效应，随WO3浓度从0到3 mol％的增加，弛豫强度降低，这种弛豫效应似乎在含WO3的玻璃中不存在超过3摩尔％。通过伪Cole-Cole图法分析了弛豫现象，并提出了造成这种弛豫效果的可能机理。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：51]

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