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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 >Electrical conductivity studies in single and mixed alkali doped cobalt-borate glasses
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Electrical conductivity studies in single and mixed alkali doped cobalt-borate glasses

机译：单一和混合碱掺杂硼酸钴玻璃的电导率研究

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The glasses of the type (Li2O)x-(CoO)(0.2)-(B2O3)(0.8-x) and (Li2O)(0.2)-(K2O)(x)-(CoO)(0.2)-(B2O3)(0.6-x) were prepared by melt quench technique and their non-crystallinity has been established by XRD studies. The glasses were investigated for room temperature density and dc electrical conductivity in the temperature range 300-550 K. Molar volumes were estimated from density data. Composition dependence of density and molar volume in both the sets of glasses has been discussed. Conductivity data has been analyzed in the light of Mott's Small Polaron Hopping (SPH) Model and activation energies were determined. Variation of conductivity and activation energy with Li2O content in single alkali glasses indicated change over conduction mechanism from predominantly electronic to ionic, at 0.4 mole fraction of Li2O. In mixed alkali glasses, the conductivity has passed through minimum and activation energy has passed through maximum at x = 0.2. This has been attributed to the mixed alkali effect. It is for the first time that a change over of predominant conduction mechanism in lithium-cobalt-borate glasses and mixed alkali effect in lithium-potassium-cobalt-borate glasses has been observed. Various physical and polaron hopping parameters such as polaron hopping distance, polaron radius, polaron binding energy, polaron band width, polaron coupling constant, effective dielectric constant, density of states at Fermi level have been determined and discussed. (C) 2007 Elsevier B.V. All rights reserved.
机译：（Li2O）x-（CoO）（0.2）-（B2O3）（0.8-x）和（Li2O）（0.2）-（K2O）（x）-（CoO）（0.2）-（B2O3）类型的玻璃通过熔融淬火技术制备了（0.6-x），并且通过XRD研究已经确定了它们的非晶性。研究了玻璃的室温密度和300-550 K温度范围内的直流电导率。根据密度数据估算了摩尔体积。已经讨论了两组玻璃中密度和摩尔体积的成分依赖性。已根据Mott的小极化子跳跃（SPH）模型分析了电导率数据，并确定了活化能。在单一的碱玻璃中，电导率和活化能随Li2O含量的变化表明，在Li2O的摩尔比为0.4时，传导机理从主要是电子转变为离子。在混合碱玻璃中，电导率已通过最小值，活化能已通过最大值x = 0.2。这归因于混合碱效应。首次观察到硼酸锂钴玻璃的主要传导机理发生了变化，而锂钾钴硼酸玻璃的混合碱效应得到了首次观察。确定并讨论了各种物理和极化子跳跃参数，例如极化子跳跃距离，极化子半径，极化子结合能，极化子带宽，极化子耦合常数，有效介电常数，费米能级的密度。 （C）2007 Elsevier B.V.保留所有权利。

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