PROTON-DOMINATED DEFECT STRUCTURES OF OXIDES AND EFFECTS ON DEFECT-DEPENDENT PROPERTIES

Publisher Website
Google Scholar
Abstract
Hydrogen may dissolve in solid oxides and form point defects. It is mainly present as protons bonded to oxygen ions, and may as such be termed interstitial protons, H1, or, equivalently, substitutional hydroxide ions, OH0. In stoichiometric oxides protons may be the dominating positive defects even at very low hydrogen activities (water vapor pressures) and high temperatures. They will be counterbalanced by electrons or point defects with negative effective charges. Limiting cases of electroneutrality conditions involving protons as majority defects are examined, with special attention to water vapor dependences. When protons dominate the defect situation, the defect-related properties (e.g. conductivity, corrosion protectivity, sintering, creep) become dependent on the water vapor pressure. The effects and their magnitude are demonstrated by a few examples. A method for determining proton conductivity is briefly mentioned

This publication has 0 references indexed in Scilit: