|About this Abstract
||Materials Science & Technology 2019
||Sintering and Related Powder Processing Science and Technologies
||Electrochemically-Driven Abnormal Grain Growth of Ionic Ceramics
||Vikrant Karrra, Wolfgang Rheinheimer, Edwin Garcia
|On-Site Speaker (Planned)
A combined theoretical and experimental analysis was performed to understand the effects of extrinsic ionic species and point defects on the microstructural evolution of ionic polycrystalline ionic solids. The model naturally incorporates the effects of drag as imposed by the interfacially accumulated charged defects for Fe-doped SrTiO3. The effect of driving forces on moving a grain boundary including space charge accumulation extent of electrostatic (Schottky) potential are quantified. The mechanisms resulting in abnormal grain growth are identified by statistically quantifying: (a) the normal grain population; (b) the abnormal, large grain population, which corresponds to those grains whose spatial extent is statistically greater than the average; and (b) any other grain size population. The proposed theory sets the stage to assess externally applied fields, i.e., temperature, electromagnetic fields, stresses and chemical stimuli to control the abnormal grain growth for developing a textured, oriented microstructures desirable for a specific application.
||Definite: At-meeting proceedings