| Autor: |
Jankov, Stevan, Djurdjic, Elvira, Skuban, Sonja, Srdic, Vladimir, Cvejic, Zeljka |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2019, Vol. 2075 Issue 1, p020003-1-020003-5, 5p, 1 Chart, 6 Graphs |
| Abstrakt: |
The electrical conductivity of nanopowder of NiFe2O4 was studied as a function of temperature and frequency. The assynthesized sample, prepared by the coprecipitation method, was analyzed by X-Ray Diffraction method (XRD) and Raman spectroscopy which confirmed the single phase formation and inverse spinel structure of nanopowder. The temperature variation of conductivity in this case was mainly attributed to change of drift mobility with temperature rather than to the variation of charge carrier concentration. According to hopping model electrons are strongly localized on the cations, whereby the additional localization of electron at Fe ions is over octahedral site in spinel lattice. The localization may be attributed to electron–phonon interaction. The existing models based on a quantum mechanical tunneling were used to explain the frequency dependent conductivity, and it has been variously assumed that electrons (or polarons) are the responsible carriers. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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