Pool-Frenkel effect and high frequency dielectric constant determination of semiconducting P₂O₅-Li₂MoO₄-Li₂O and P₂O₅-Na₂MoO₄-Na₂O bulk glasses

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• 作者：Dariush Souri (1) d.souri@gmail.com
  Mohammad Elahi (2)
  Mohammad S. Yazdanpanah (3)
• 关键词：Pool ; Frenkel effect ; strong electric field ; amorphous ; transition metal oxides ; dielectric constant
• 刊名：Central European Journal of Physics
• 出版时间：June 2008
• 出版年：2008
• 期刊代码：pc952_1895-1082
• 类别：ph
• 卷：6
• 期：2
• 页码：306-310
• 数据来源：sp

摘要

The ternary 70P₂O₅-10Li₂MoO₄-20Li₂O and 70P₂O₅-10Na₂MoO₄-20Na₂O glasses, prepared by the press-melt quenching technique, were studied at temperatures between 298 and 418 K for their high dc electric field properties. For the above purpose, the effect of a strong electric field on the dc conduction of these amorphous bulk samples was investigated using the gap-type electrode configuration. At low electric fields, the current-voltage (I — V) characteristics have a linear shape, while at high electric fields (> 103 V/cm), bulk samples show nonlinear effects (nonohmic conduction). Current-voltage curves show increasing departure from Ohm’s law with increasing current density, leading to critical phenomena at a maximum voltage (threshold voltage), known as switching (switch from a low-conduction state to a higher-conduction state at threshold voltage). The Pool-Frenkel high-field effect was observed at electrical fields of about 103–104 V/cm; then the lowering factor of the potential barrier, the high frequency dielectric constant, and the refractive index of these glasses were determined.