Engineering Ceramics: Microstructure-Property-Performance Relations and Applications: Engineering Ceramics
Sponsored by: ACerS Engineering Ceramics Division
Program Organizers: Young-Wook Kim, University of Seoul; Hua-Tay Lin, Guangdong University of Technology; Junichi Tatami, Yokohama National University
Tuesday 2:00 PM
October 19, 2021
Room: B233
Location: Greater Columbus Convention Center
Session Chair: Ivar Reimanis, Colorado School of Mines
2:00 PM Invited
Tracking the State of Transition Elements Ni and Fe in Oxide Microstructures: Michael Knight1; Ivar Reimanis1; Dylan Jennings1; Sandrine Ricote1; Wolfgang Rheinheimer2; 1Colorado School of Mines; 2Julich Research Center
Small amounts of Ni may have a profound effect on the sintering, microstructure development, and final properties of perovskite oxides used in catalysis, fuel cells, solar water-splitting, and other functional applications. The role of Ni is coupled to its state: it may be metallic, part of a compound, in solid solution or segregated at interfaces as isolated ions (Ni2+, Ni3+). Each state exhibits a unique magnetic signature and thus magnetic measurements may be used to track Ni in the microstructure. The present work examines such measurements in yttrium-doped barium zirconate containing Ni and another material system of interest, strontium titanate containing Fe. Magnetometry is demonstrated to be a powerful tool for evaluating oxidation state of transition elements present at low concentrations in ceramic oxides.