|About this Abstract
||Materials Science & Technology 2012
||Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
||Internal Reduction of Ni, Co, and Fe-Doped YSZ Characterized with SQUID Magnetometry
||Amy Morrissey, Jianhua Tong, Ivar Reimanis, Jim R O'Brien
|On-Site Speaker (Planned)
Transition metal (M = Ni, Co, Fe) doped Y<sub>2</sub>O<sub>3</sub>-stabilized ZrO<sub>2</sub> (YSZ) has applications in electrochemical devices operated in reducing and oxidizing atmospheres. High purity chemical synthesis methods are used to make specimens containing M dopant dissolved in the YSZ matrix. The influence of small concentrations (0.01 to 1 mol %) of M dopant on the sintering and microstructure development of YSZ is examined with X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Fundamental in situ and ex situ studies are performed using SQUID VSM magnetometry to characterize the dopant during internal reduction and monitor the extent of the reaction. Microscopy techniques depict nano- and micro-structural features of the reduced specimens. It is shown that SQUID magnetometry is a useful quantitative tool to distinguish between M as an ion in solution or an ion in secondary phase, and M as a metallic inclusion of various sizes.