Electrical Charge Transfer in Complex Oxides

• Authors: V. Shevchuk , I. Kayun
• Languages of publication: EN

Abstracts

EN

The electrophysical properties (temperature-frequency dependence of conductivity and dielectric constant, current of depolarization) of complex oxide single crystals (Ca-Ga-Ge-garnet, Ca-Ga-germanate, Pb-, Ca-, Cd-tungstates) are analyzed. The experimental results for different crystallographic axes were obtained in the frequency range 10-10^{5} Hz and temperature range 290-650 K. The main parameters of conductivity and depolarization currents are determined. The nature of polarization charge induced by applied external field is discussed using the model of polarization at hopping exchange of charge between complex dipolar defects and space-inhomogeneous distribution of charge in the sample. Existence of small polarons in the crystals is considered.

Keywords

EN

72.20.-i; 72.80.-r; 77.22.Gm; 77.84.-s

Discipline

• 77.22.Gm: Dielectric loss and relaxation
• 77.84.-s: Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials(for nonlinear optical materials, see 42.70.Mp; for dielectric materials in electrochemistry, see 82.45.Un)
• 72.80.-r: Conductivity of specific materials(for conductivity of metals and alloys, see 72.15.-v)
• 72.20.-i: Conductivity phenomena in semiconductors and insulators(see also 66.70.-f Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves)

• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 117
• Issue: 1
• Pages: 150-154

Dates

published

2010-01

Contributors

author

V. Shevchuk

• Laboratory of Oxide Crystals, Department of Electronics, Lviv Ivan Franko National University, Lviv, Ukraine

author

I. Kayun

• Laboratory of Oxide Crystals, Department of Electronics, Lviv Ivan Franko National University, Lviv, Ukraine

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Identifiers

DOI

10.12693/APhysPolA.117.150