Royal Society of Chemistry, Physical Chemistry Chemical Physics, 16(17), p. 11103-11106, 2015
DOI: 10.1039/c4cp05737f
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Here, we show that the Onsager cross terms for ion-electron interaction are not an artifact, but the necessity to phenomenologically completely describe the mass/charge transport of a mixed ionic-electronic conductor in terms of mobile charged components which are the only experimentally operable quantities. The use of an appropriate comprehensive defect model may help to reduce the cross terms (which depend on the choice of the formal charge of the mobile defects), but it cannot obviate them if long-range Coulombic interaction is in action among defects.