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Charge compensation mechanisms in Li‐substituted high‐entropy oxides and influence on Li superionic conductivity
Author(s) -
Osenciat Nicolas,
Bérardan David,
Dragoe Diana,
Léridon Brigitte,
Holé Stéphane,
Meena Arun K.,
Franger Sylvain,
Dragoe Nita
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16511
Subject(s) - thermogravimetric analysis , conductivity , materials science , oxide , oxygen , electrical resistivity and conductivity , analytical chemistry (journal) , fast ion conductor , ionic conductivity , cobalt , inorganic chemistry , chemistry , electrolyte , electrode , metallurgy , organic chemistry , chromatography , electrical engineering , engineering
The charge compensation mechanisms that occur when Li + substitutes a 2+ element in superionic conductor (MgCoNiCuZn)O high‐entropy oxide have been studied using a combination of thermogravimetric analysis and X‐ray photoemission spectroscopy. Depending on the concentration of Li + in the compound, the charge compensation involves first partial oxidation of Co 2+ into Co 3+ for low fraction of Li + , and then a combination of both the oxidation of cobalt and the formation of oxygen vacancies for large fraction of Li + .