Activation energy and conductivity of glasses in the P2O5–V2O5–Li2O system |
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Authors: | H Behzad M H Hekmatshoar M Mirzayi M Azmoonfar |
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Institution: | (1) Faculty of Basic Sciences, Sahand University of Technology, Tabriz, Iran; |
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Abstract: | The conductivity of glasses in the
50\textP\text2 \textO\text5 - x\textV\text2 \textO\text5 - ( 50 - x )\textLi\text2 \textO50{\text{P}}_{\text{2}} {\text{O}}_{\text{5}} - x{\text{V}}_{\text{2}} {\text{O}}_{\text{5}} - \left( {50 - x} \right){\text{Li}}_{\text{2}} {\text{O}} system was studied as a function of temperature and composition. For all compositions, the conductivity variation as a function
of temperature followed an Arrhenius type relationship. Isothermal variation of conductivity as a function of composition
showed a minimum for a molar ratio x near 20. Probable mechanisms for decrease of conductivity with decrease of vanadium oxide concentration were explained. The
minimum in room temperature was attributed to increase of V4+/V5+ with decrease of vanadium oxide in specific concentrations of vanadium oxide. Activation energy increased with decrease of
V2O5 content. This behavior was attributed to increase of average spacing between vanadium ions. |
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