Complete representation of isothermal mass and charge transport properties of mixed ionic electronic conductors

► Onsager matrix is proposed to represent all transport properties of a mixed conductor. ► Experiments to determine the matrix are presented with their working principle. ► As-measured matrices are presented for doped TiO2 and CeO2 and La2NiO4. ► Transport properties are retrieved from the matrix for La2NiO4 for example.