| About this Abstract |
| Meeting |
2010 TMS Annual Meeting & Exhibition
|
| Symposium
|
Computational Thermodynamics and Kinetics
|
| Presentation Title |
Pressure-Induced Invar Behavior in Pd3Fe |
| Author(s) |
Michael L. Winterrose, Matt S Lucas, Alan F. Yue, Itzhak Halevy, Lisa Mauger, Jorge A. Munoz, Jingzhu Hu, Michael Lerche, Brent Fultz |
| On-Site Speaker (Planned) |
Michael L. Winterrose |
| Abstract Scope |
Synchrotron x-ray diffraction (XRD) measurements, nuclear forward scattering (NFS) measurements, and density functional theory (DFT) calculations were performed on L12-ordered Pd3Fe. Measurements were performed at 300 K at pressures up to 33 GPa, and at 7 GPa at temperatures up to 650 K. The NFS revealed a collapse of the 57Fe magnetic moment between 8.9 and 12.3 GPa at 300 K, coinciding with a transition in bulk modulus found by XRD. Heating the sample under a pressure of 7 GPa showed negligible thermal expansion from 300 to 523 K, demonstrating Invar behavior. Zero-temperature DFT calculations showed a ferromagnetic ground state and several antiferromagnetic states of comparable energy at pressures above 20 GPa. |
| Proceedings Inclusion? |
Definite: A CD-only volume |