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DOE OSTI2020

Materials Data on YZr by Materials Project

ZrY crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Y is bonded to six equivalent Y and six equivalent Zr atoms to form YY6Zr6 cuboctahedra that share corners with eighteen equivalent YY6Zr6 cuboctahedra, edges with six equivalent YY6Zr6 cuboctahedra, edges with twelve equivalent ZrY6Zr6 cuboctahedra, faces with eight equivalent YY6Zr6 cuboctahedra, and faces with twelve equivalent ZrY6Zr6 cuboctahedra. All Y–Y bond lengths are 3.42 Å. All Y–Zr bond lengths are 3.35 Å. Zr is bonded to six equivalent Y and six equivalent Zr atoms to form ZrY6Zr6 cuboctahedra that share corners with eighteen equivalent ZrY6Zr6 cuboctahedra, edges with six equivalent ZrY6Zr6 cuboctahedra, edges with twelve equivalent YY6Zr6 cuboctahedra, faces with eight equivalent ZrY6Zr6 cuboctahedra, and faces with twelve equivalent YY6Zr6 cuboctahedra. All Zr–Zr bond lengths are 3.42 Å.

36 MATERIALS SCIENCE↗

DOE OSTI2021

Influence of the Cubic Sublattice on Magnetic Coupling between the Tetrahedral Sites of Garnet

Here, we present a study on the nuclear and magnetic structures of two iron-based garnets with magnetic cations isolated on tetrahedral sites. Ca 2 YZr 2 Fe 3 O 12 and Ca 2 LaZr 2 Fe 3 O 12 offer an interesting comparison for examining the effect of increasing cation size within the diamagnetic backbone of the garnet crystal structure, and how such changes affect the magnetic order. Despite both systems exhibiting well-pronounced magnetic transitions at low temperatures, we also find evidence for diffuse magnetic scattering due to a competition between the nearest-neighbor, next nearest-neighbor, and so on, within the tetrahedral sites. This competition results in a complex noncollinear magnetic structure on the tetrahedral sublattice creating a mixture of ferro- and antiferromagnetic interactions above the long-range ordering temperature near 20 K and suggests that the cubic site of the garnet plays a significant role in mediating the superexchange interactions between tetrahedral cations.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗

DOE OSTI2025

Recent Metallic Fuel Data Recovery in FIPD

The Metallic Fuels Irradiation and Physics Database (FIPD) [1] is an organized collection of metallic fuel test pin data (U-xPu-yZr, = 0 ~ 28; y = 2 ~ 10) and documentation available to industry. FIPD mainly contains three types of data: (1) Fuel pin fabrication data, including fuel slug diameter, fuel slug length, cladding diameter, smear density, etc. (2) Fuel pin operation conditions, including axial distributions for power, temperatures, fluences, burnup, and isotopic densities, etc. and (3) Fuel pin post-irradiation examination (PIE) data, including fission gas release and gas chemistry, profilometry, and neutron radiography, etc. The operating conditions for pins with PIE data available in FIPD span significant ranges across key parameters. The fuel peak burnup extends from less than 5% up to 20 at%. The cladding peak temperature varies from about 490°C to 660°C. Finally, the cladding peak DPA shows a wide range from less than 5 to 120. These broad ranges reflect the diverse testing conditions and operational parameters captured in the available PIE data. More detail about FIPD can be found in ref. [2]. The database development is an ongoing effort covering metallic fuel experiments from the Experimental Breeder Reactor II (EBR-II) and the Fast Flux Test Facility (FFTF). As reported in the ref. [3, 4], most of the PIE data generated during the IFR program [5] has been collected, reviewed, processed, and integrated into FIPD. The most recently added PIE data can be found in ref. [4], which shows the collection of over 95% of the PIE data by the time of this paper. The recent improvements to the database are summarized in this paper.

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS↗