About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Magnetic Materials for Energy and Power Conversion Applications
|
Presentation Title |
Role of Fe in Stabilizing Ce(Co, Fe, Cu)<sub>5</sub> and Enhancing Its Magnetic Properties |
Author(s) |
Matthew J. Kramer, Oleana Palasyuk, Tae-Hoon Kim, Lin Zhou, Sergey Budko, Paul Canfield, Andriy Palasyuk |
On-Site Speaker (Planned) |
Matthew J. Kramer |
Abstract Scope |
The Ce(Co<sub>1-x</sub>Fe<sub>x</sub>)<sub>4.4</sub>Cu<sub>0.6</sub> (0 ≤ x ≤ 0.19) shows potential as a ‘gap’ magnet and provides insight into novel composition/structure relationship to coercivity. The X-ray, SEM and TEM analyses confirm this is a RETM<sub>5</sub>-type single-phase material at high temperature (RE – rare earth, and TM - transition metals Co, Cu and Fe). After heat treatment, these compounds forms dense arrays of basal plane 2:7-type stacking faults. With increasing Fe, these stacking faults segregate into various closely related 1:5 and 1:2 structural units related to RE<sub>2</sub>TM<sub>7</sub> and RE<sub>5</sub>TM<sub>19</sub> precipitates. The measured anisotropy energy density, Curie temperature, magnetization, remanance and coercivity all increase with increasing Fe up to x = 0.186, near the solubility limit of Fe. Fe and Cu initially stabilize CaCu<sub>5</sub> type-structure, but with increasing Fe, the structure locally competes 2:7-like structural arrangements forming planar defects. These defects, together with the increasing anisotropy field, are crucial to greatly improved magnetic properties. |
Proceedings Inclusion? |
Planned: |
Keywords |
Magnetic Materials, Characterization, Phase Transformations |