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

• Authors: Dariush Souri , Mohammad Elahi , Mohammad Yazdanpanah
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

Pool-Frenkel effect; strong electric field; amorphous; transition metal oxides; dielectric constant

Discipline

• 72.15.Cz: Electrical and thermal conduction in amorphous and liquid metals and alloys

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2008
• Volume: 6
• Issue: 2
• Pages: 306-310

Dates

published

1 - 6 - 2008

online

26 - 3 - 2008

Contributors

author

Dariush Souri

• School of Physics, Damghan University of Basic Sciences, Damghan, Iran

author

Mohammad Elahi

• Department of Physics, Faculty of Science, Razi University, Kermanshah, Iran

author

Mohammad Yazdanpanah

• Azad University of Behabhan, Behbahan, Iran

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Identifiers

DOI

10.2478/s11534-008-0031-3