首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >Electrical and EPR studies of yLi_2O centre dot (1-y)[0.40(MoO_3)_2 centre dot 0.60(P_2O_5)] glasses
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Electrical and EPR studies of yLi_2O centre dot (1-y)[0.40(MoO_3)_2 centre dot 0.60(P_2O_5)] glasses

机译:yLi_2O中心点(1-y)[0.40(MoO_3)_2中心点0.60(P_2O_5)]的电子和EPR研究

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摘要

The effect of Li_2O in the yLi_2O centre dot (1-y)[0.40(MoO_3)_2 centre dot 0.60(P_2O_5)] ternary system has been studied by impedance spectroscopy (IS) and electron paramagnetic resonance (EPR) spectroscopy. DC electrical conductivity data obeys an Arrhenius type behaviour in the temperature range 273-520 K. For glasses which correspond to region I (y<0.20), electrical conductivity can be interpreted by the small polaron model. In such a glass, molybdenum has two valence states Mo~(5+) and Mo~(6+). In the y>0.20 domain (region II), ionic conductivity prevails. EPR spectra show that the interaction between molybdenum Mo~(5+) centres (which are essential for electronic hopping) strongly depends on Li_2O content. The resolution of the hyper fine structure, involving coupling to odd ~(95)Mo and ~(97)Mo isotopes, for glasses with high y value is in agreement with their electrical behaviour.
机译:通过阻抗光谱(IS)和电子顺磁共振(EPR)光谱研究了Li_2O在yLi_2O中心点(1-y)[0.40(MoO_3)_2中心点0.60(P_2O_5)]三元体系中的作用。直流电导率数据在273-520 K的温度范围内遵循Arrhenius型行为。对于与区域I(y <0.20)对应的玻璃,电导率可以用小极化子模型来解释。在这种玻璃中,钼具有两个价态Mo〜(5+)和Mo〜(6+)。在y> 0.20域(II区)中,离子电导率占优势。 EPR光谱表明,钼Mo〜(5+)中心之间的相互作用(对于电子跳跃必不可少)在很大程度上取决于Li_2O的含量。具有高y值的玻璃的超精细结构的分辨力,包括耦合至奇数〜(95)Mo和〜(97)Mo同位素,与它们的电学行为一致。

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