High-temperature charge transport in Nd0.25Sr0.75FeO3−δ: the influence of various factors

Autor:	Ilia A. Leonidov, O.V. Merkulov, Mikhail V. Patrakeev, Sergey S. Nikitin
Rok vydání:	2021
Předmět:	Electron mobility Materials science Oxide Analytical chemistry chemistry.chemical_element Partial pressure Conductivity Electrochemistry Oxygen Inorganic Chemistry chemistry.chemical_compound chemistry Electrical resistivity and conductivity Charge carrier
Zdroj:	Dalton Transactions. 50:11429-11439
ISSN:	1477-9234 1477-9226
Popis:	The oxygen content and electrical conductivity in Nd0.25Sr0.75FeO3−δ were measured in the range of oxygen partial pressure from 10−19 to 0.5 atm at 750–950 °C by coulometric titration and four-probe dc techniques. The thermodynamic analysis of defect equilibrium in the oxide allowed successful simulation of the oxygen content data and calculation of charge carrier concentrations that were used for the analysis of electrical conductivity. The electrical conductivity data were accurately described in the models, which implied that the hole mobility increased upon an increase in the oxygen content in the oxide. The results suggest that only some of the Fe3+ sites are available for hole transport, and their fraction increases with an increase in the oxygen content. The migration energy for oxygen ions, electrons and holes was found to be 0.89 ± 0.02, 0.62 ± 0.01 and 0.230 ± 0.006 eV, respectively. Nd0.25Sr0.75FeO3−δ was shown to have a considerable oxygen conductivity (0.12 S cm−1 at 950 °C) and fairly good stability under reducing conditions, which is a good recommendation for using this oxide as a functional material in high-temperature electrochemical applications.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c6ee28758a79eb17009da3e1f83bda5b https://doi.org/10.1039/d1dt02050a Zobrazit plný text záznamu