December 13, 2019
Dariush Souri

Dariush Souri

Academic rank: Associate professor
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Education: Ph.D in فیزیک
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Faculty: science

Research

Title Pool-Frenkel Effect and High Frequency Dielectric Constant Determination of Semiconducting P2O5 –Li2MoO4-Li2O and P2O5 –Na2MoO4-Na2O Bulk Glasses
Type Article
Keywords
Pool-Frenkel effect • strong electric field • amorphous • transition metal oxides • dielectric constant
Journal Central European Journal of Physics
Researchers Dariush Souri

Abstract

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 elec- trical 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.