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Multiphonon hopping conduction in carbon-nickel composite films at different deposition time

Rare Metals 2018年第2期37卷 143-147页

作者： Vali Dalouji S.Mohammad Elahi Shahoo Valedbagi Department of Physics Malayer University Plasma Physics Research Center Science and Research BranchIslamic Azad University

In this work, the electrical properties of car- bon-nickel composite films deposited at different time （50-600 s） were investigated. The films were grown by radio frequency magnetron sputtering on glass substrates at room temperature. The electrical conductivity of the films was investigated in the temperature range of 15-500 K. The conductivity data in the temperature range of 400-500 K show the extended state conduction mecha- nism, while the multiphonon hopping （MPH） conduction is found to dominate the electrical transport in the tempera- ture range of 150-300 K. The films deposited at 180 s have the maximum conductivity. The conductivity at T 〈 60 K could be described in terms of variable range hopping （VRH） conduction. The localized state density around Fermi level （N（EF）） at low temperature for the films deposited at 180 s has the minimum value of about 4.02 × 10^21 cm^-***^-1. The average hopping distance （Rhop） for the films deposited at 180 s has the maximum value of about 3.51 × 10^-7 cm.

关键词： Carbon-nickel films Deposition time Deposition rate Electrical conductivity Activation energy hopping conductivity

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Electric properties of La_(0.8)Sr_(0.2)CoO_3 nanoceramics

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Journal of Rare Earths 2009年第4期27卷 646-650页

作者： A.Chuchmaa R.J.Wiglusz B.Macalik P.Guchowski B.Mazurek W.Strek Electrotechnical Institute Division of Electrotechnology and Materials Wroctaw Poland Institute for Low Temperature and Structure Research Polish Academy of Sciences P.O.Box 937 50-442 Wroctaw Poland

The electric measurements were carried out for La0.8Sr0.2CoO3 nanoceramics by using impedance spectroscopy methods. The resistance of sample was practically independent of frequency in measurement range. Its dependence on reciprocal temperature showed quite complicated mechanism of conduction. The most striking property of investigated sample was its resistance decreasing with increasing applied polarization.

关键词： perovskite lanthanum strontium cobaltite hopping conductivity impedance spectroscopy rare earths

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Features of the conductivity of the Ag₈Ge_1-xMn_xTe₆ Solid Solutions

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Journal of Materials Science and Chemical Engineering 2022年第5期10卷 16-28页

作者： Rashad Rahimov Aynur Gahramanova Durdana Arasly Almaz Halilova Ilgar Mammadov Institute of Physics of Azerbaijan National Academy of Sciences Baku Azerbaijan

Samples of Ag8Ge1-xMnxTe6 solid solutions with different manganese content (x = 0, 0.05, 0.1, 0.2) were prepared by fusing and further pressing their powders under the pressure of 0.6 GPa. In addition of Mn atoms to the Ag8GeTe6 compound leads to compression of their lattice. All p-type samples acquire a high resistance below the transition at temperatures of 180 - 220 K. The electrical conductivity of all compositions in the range of 220 - 300 K increases due to hopping mechanism, and at temperatures T > 320 K, a semiconductor characteristic is observed. By studying impedance spectra of samples, it was established that at 80 K solid solutions behave like a homogeneous dielectric material. At high temperatures and frequencies of an external electric field, a significant role of grain boundaries in conductivity was revealed. The dielectric anomaly occurring at low frequencies is also associated with an effect that manifests itself in the grain boundary.

关键词： Solid Solutions X-Ray Diffraction hopping conductivity Electrical conductivity Impedance Spectra

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