Room temperature lithium superionic conductivity in high entropy oxides

Impedance spectroscopy measurements evidence superionic Li+ mobility (>10(-3) S cm(-1)) at room temperature and fast ionic mobility for Na+ (5 x 10(-6) S cm(-1)) in high entropy oxides, a new family of oxide-based materials with the general formula (MgCoNiCuZn)(1-x-y)Ga(y)A(x)O (with A = Li, Na, K). Structural investigations indicate that the conduction path probably involves oxygen vacancies.