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首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >Electrical transport studies in barium borovanadate glasses
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Electrical transport studies in barium borovanadate glasses

机译：硼酸钡钡玻璃的电气传输研究

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摘要

The electrical response of four barium borovanadate glasses, 15 V_2O_5.xBaO.(85-x)B_2O_3, where x=20, 25, 30 and 35 mol%, has been investigated between room temperature and 600 K as a function of frequency (0(centre dot)1-500 kHz). DC activation barriers calculated from the complex impedance plots decrease linearly with BaO concentration indicating that ionic conductivity dominates in these glasses. The possible origin of low temperature departures of conductivity curves (from linearity) of vanadium rich glasses in ln #sigma# versus 1/T plots is discussed. The ac conductivity curves have been fitted to the almond-West type power low expression #sigma#(#omega#)=#sigma#(0)+A#omega#~s with use of a single value of s. It is found that most of the glasses exhibit a temperature dependent minimum. The dielectric data are converted into moduli (M) and are analysed using the Kohlrausch-Williams-Watts (KWW) stretched exponential function. The activation barriers, w, calculated form the temperature dependent dielectric loss peaks compare well with the activation barriers, #DELTA#E, calculated form the dc conductivity plots. The stretching exponent #beta# is found to be temperature independent and is not likely to be related as in the equation #beta#=1-s.
机译：已经研究了室温和600 K之间随频率变化的四种硼酸钡玻璃15 V_2O_5.xBaO。（85-x）B_2O_3的电响应，其中x = 20、25、30和35 mol％ （中心点）1-500 kHz）。由复数阻抗图计算出的DC激活势垒随BaO浓度线性降低，表明离子电导率在这些玻璃中占主导地位。讨论了ln＃sigma＃与1 / T曲线中富钒玻璃的电导率曲线（因线性）的低温偏离的可能起源。交流电导率曲线已通过使用单个s值拟合到杏仁西式功率低表达式#sigma＃（＃omega＃）=＃sigma＃（0）+ A＃omega＃〜s。发现大多数眼镜表现出与温度有关的最小值。将介电数据转换为模数（M），并使用Kohlrausch-Williams-Watts（KWW）扩展指数函数进行分析。从与温度相关的介电损耗峰值计算得出的激活势垒w与从直流电导率曲线计算得出的激活势垒＃DELTA＃E很好地比较。发现拉伸指数＃beta＃与温度无关，并且不可能如方程式＃beta＃= 1-s那样相关。

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