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首页> 外文期刊>Physica, B. Condensed Matter >Effect of alkali content on AC conductivity of borate glasses containing two transition metals
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Effect of alkali content on AC conductivity of borate glasses containing two transition metals

机译：碱含量对含两种过渡金属硼酸盐玻璃交流电导率的影响

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摘要

Sodium borate glasses containing iron and molybdenum ions with the total concentration of transitionions constant and gradual substitution of sodium oxide (network modifier) by borate oxide (networkformer) was prepared. Densities, molar volume, DC and AC conductivities are measured. The trends ofthese properties are attributed to changes in the glass network structure. Their DC and AC conductivityincreased with increasing NaO concentration. The increase of AC conductivity of sodium borate glassesis attributed to the chemical composition and the hopping mechanism of conduction. Measurements ofthe dielectric constant (ε) and dielectric loss (tan δ) as a function of frequency (50 Hz-100 kHz) andtemperature (RT-600 K) indicate that the increase in dielectric constant and loss (ε and tan δ) valueswith increasing sodium ion content could be attributed to the assumption that Fe and Mo ions tend toassume network-forming position in the glass compositions studied.The variation of the value of frequency exponent s for all glass samples as the function oftemperature at a definite frequency indicates that the value of s decreases with increasing thetemperature which agrees with the correlated barrier-hopping (CBH) model.
机译：制备含有铁和钼离子的硼酸钠玻璃，其总过渡浓度恒定，并且氧化硼（网络改​​性剂）逐渐被氧化硼（网络形成剂）取代。测量密度，摩尔体积，直流和交流电导率。这些性质的趋势归因于玻璃网络结构的变化。它们的直流和交流电导率随NaO浓度的增加而增加。硼酸钠玻璃的交流电导率的增加归因于化学成分和传导的跳跃机制。介电常数（ε）和介电损耗（tanδ）作为频率（50 Hz-100 kHz）和温度（RT-600 K）的函数的测量结果表明，介电常数和损耗（ε和tanδ）值随增加而增加钠离子含量可以归因于以下假设：在研究的玻璃成分中，Fe和Mo离子倾向于假定网络形成位置。所有玻璃样品的频率指数s值随温度的变化在一定频率下均表明： s的值随温度的升高而减小，这与相关的障碍物跳跃（CBH）模型相符。

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