| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
2025 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-123: Revisiting the Composition and Crystal Structure of WB2-x for Fusion Neutron Shielding |
| Author(s) |
Sercan Cetinkaya, Edward G. Obbard, Patrick A. Burr, Kevin J. Laws, Vanessa K. Peterson |
| On-Site Speaker (Planned) |
Sercan Cetinkaya |
| Abstract Scope |
WB2-x, formerly known as W2B5, is a promising material for shielding components in nuclear fusion reactors, where its performance is closely related to boron number density, and hence stoichiometry. In this study, the stoichiometry range of the WB2-x was measured using neutron powder diffraction. Samples were synthesized with isotopically-enriched 11B in an arc melter and annealed at 1500 0C for 24 hours in a vacuum furnace with compositions ranging from 60 at.% B (B-lean) to 68 at.% B (B-rich). Our results show that the accepted phase diagram needs revision, whereby WB2-x has a narrow phase region, estimated by Rietveld refinement between 63.8 and 64.1 at. % B. This is 7.3-7.6 at. % less B than the previously reported W2B5 phase, and we propose a new formula: WB2-x (P63/mcm). Neutron diffraction results show how the B deficiency was accommodated nearly entirely on only one of four B sublattice, the 2a site. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Characterization, Nuclear Materials, Other |