Hopping conductivity in lithium-iron spinel doped with La,Y

A.V. Vakalyuk; V.M. Vakalyuk; O.P. Pakhovskyi; I.M. Hasiuk

doi:10.15330/pcss.26.1.53-57

Authors

A.V. Vakalyuk Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
V.M. Vakalyuk Ivano-Frankivsk National Technical University of Oil and Gas Ivano-Frankivsk, Ukraine
O.P. Pakhovskyi Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
I.M. Hasiuk Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine

DOI:

https://doi.org/10.15330/pcss.26.1.53-57

Keywords:

impedance spectroscopy, spinel, Arrhenius curves, hopping mechanism of conductivity, Fermi level

Abstract

The temperature-frequency dependences of the electrical characteristics of Li₂Fe_2,5-xMe_xO₄(Ме=La;Y, x=0;0.01;0.03;0.05) spinels synthesized by the «sol-gel» autocombustion technology were obtained by the method of impedance spectroscopy in the temperature range of 293-473 K.

Based on their analysis, the main mechanisms of conductivity of these materials in the studied temperature range were identified: hopping and activation. It was shown that at low temperatures the hopping mechanism of conductivity dominates. The main parameters of hopping conductivity have been determined. The effect of doping lithium-iron spinels with rare-earth metal impurities on them has been investigated.

Методом імпедансної спектроскопії отримані температурно-частотні залежності електричних характеристик Li₂Fe_2,5-xМе_xO₄(Ме=La;Y, x=0;0,01;0,03;0,05) шпінелей, синтезованих за технологією «золь-гель» автоспалювання, в інтервалі температур 293-473К. На основі їх аналізу виявлені основні механізми провідності цих матеріалів в досліджуваному інтервалі температур: стрибковий та активаційний. Показано, що при низьких температурах домінує стрибковий механізм провідності. Встановлено основні параметри стрибкової провідності. Досліджено вплив на них легування літій-залізних шпінелей доміщками рідкісноземельних металів.

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