Journal
SCIENTIFIC REPORTS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-018-24433-9
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Funding
- DOE-NNSA [US DE-NA0002004]
- DOE Office of Basic Energy Sciences [DE-AC52-06NA25396]
- NSF-MRI [DMR-0420532]
- ONR-DURIP [N00014-0400798, N00014-0610539, N00014-0910781]
- Initiative for Sustainability and Energy at Northwestern University (ISEN)
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource through Northwestern's Materials Research Center [NSF NNCI-1542205]
- MRSEC program through Northwestern's Materials Research Center [NSF DMR-1121262]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the IIN
- U.S. NRC [NRC-HQ-84-15-G-0028]
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Crystalline Pd/Pd-Ag membranes are widely used for hydrogen separation from CO2 and other gases in power generation applications. To substitute these high cost noble metal alloy membranes, the Ni-Nb-Zr amorphous alloys are being developed that exhibit relatively high permeability of hydrogen between 200-400 degrees C. Atom probe tomography (APT) experiments performed on these ribbons revealed nm-scale Nb-rich and Zr-rich regions (clusters) embedded in a ternary matrix, indicating phase separation within the Ni-Nb-Zr amorphous alloy. Density functional theory (DFT) simulations have predicted that these clusters are composed of icosahedral coordination polyhedra. The interatomic distances and correlation lengths of the short range order of these alloys were determined by neutron total scattering which match well with our DFT based molecular dynamics (DFT-MD) simulations.
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