title: Formation of protonic defects in perovskite-type oxides with redox-active acceptors: case study on Fe-doped SrTiO(3).
abstract: The thermodynamics of water incorporation into Fe-doped SrTiO(3) was investigated by thermogravimetric measurements. Changes in valence states of redox-active dopant ions (Fe(3+)/Fe(4+)) with water vapor pressure were taken into account in the defect chemical analysis. The proton solubility was significantly enhanced by the presence of the redox centers. The hydration enthalpies and entropies were -60 kJ mol(-1) and -122 J mol(-1) K(-1). The defect chemical model was applied to describe the water vapor dependence of the electrical conductivity in mixed ionic and electronic conducting Fe-doped SrTiO(3) single crystals.
authors.affiliation: Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany.
authors.forename: Ji
authors.initials: J
authors.lastname: Haeng Yu
authors.forename: Jong-Sook
authors.initials: JS
authors.lastname: Lee
authors.forename: Joachim
authors.initials: J
authors.lastname: Maier
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D011522:Protons; D012995:Solubility; D013324:Strontium / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D013818:Thermogravimetry; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*; D014835:Volatilization; D014867:Water / Q000737:chemistry
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D011522:Protons; D014867:Water; C059910:perovskite; D014025:Titanium; D007501:Iron; C119252:strontium titanium oxide; D013324:Strontium