|About this Abstract
||Materials Science & Technology 2017
||Processing and Performance of Materials Using Microwaves, Electric and Magnetic Fields, Ultrasound, Lasers, and Mechanical Work – Rustum Roy Symposium
||Influence of Applied Magnetic Fields on Rare-earth & Transition Metal Dopants in α-Al2O3
||Selva Vennila Raju, Michael Kornecki, Raymond Brennan, Victoria Blair, Nicholas Ku
|On-Site Speaker (Planned)
||Selva Vennila Raju
Under the presence of a magnetic field, many unique metallurgical phenomena, including modification of microstructure, texture, phase growth, grain boundary energy, and Gibb’s free energy, have been discovered. However, most of the underlying mechanisms responsible for these magnetic field effects have not yet been identified. Therefore, fundamental studies are required to clarify the elemental processes that dictate microstructural evolution and crystallographic texturing during magnetic field processing. Alpha-alumina (α-Al2O3) is a diamagnetic material that exhibits weak interactions with magnetic fields, but doping with various metallic particles can lead to significant enhancement of the magnetic response. In order to understand the underlying mechanisms, α-Al2O3 doped with rare-earth and transition metals were processed under magnetic fields (typically on the order of 2 Tesla), and resulting magnetic properties (magnetic moment, susceptibility, etc.) were evaluated. The effect of various dopants on magnetization and its correlation with respect to crystallographic orientation will be discussed.