Impedance spectroscopy measurements evidence superionic Li + mobility (>10 À3 S cm À1 ) at room temperature and fast ionic mobility for Na + (5 Â 10 À6 S cm À1 ) in high entropy oxides, a new family of oxide-based materials with the general formula (MgCoNiCuZn) 1ÀxÀy Ga y A x O (with A ¼ Li, Na, K). Structural investigations indicate that the conduction path probably involves oxygen vacancies.
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