Development of extremely high-temperature X-ray absorption fine structure measurement method for oxide samples

Abstract

Click to increase image sizeClick to decrease image size AcknowledgementsThis research was supported by the Japan MEXT National Problem-Making R&D Promotion Project “Acceleration of Nuclear Fuel Development Research Incorporating Artificial Intelligence (AI) Technology” for the Nuclear Energy System Research and Development Project. The synchrotron radiation experiments were performed at BL22XU in SPring-8 with the approval of the Japan Atomic Energy Agency (Proposals No. 2022A3744, 2022B3714, and 2023A3714).Figure 1. Phase diagram of ZrO2–Y2O3 system [Citation7].Display full size Figure 2. Equipment for high-temperature measurement.(a). Photograph of heating chamber. (b). Schematic diagram of heating system.Display full size Figure 3. Newly conceived sample holder with slit for high-temperature X-ray absorption fine structure measurement.Display full size Figure 4. Current density distribution (element vector) near the slit of a heater by finite-element analysis (at current = 120 A).Display full size Figure 5. Temperature distribution using finite-element analysis of a slit heater (at current = 120 A)Display full size Figure 6. Temperature relative to current value estimated using finite-element method analysis.Display full size Figure 7. High-temperature X-ray absorption fine structure spectra obtained from room temperature (RT) to 3427 K.Display full size Figure 8. X-ray absorption fine structure spectra of 10A (solid phase) and 180A (liquid phase) and absorption change α(×10).Display full size Figure 9. Plotting Δα versus current for phase transformation and melting analysis. (Error bars on the X-axis are control variations in current values, which are 0.1A. Because they are extremely small, the error bars look like crosses. Error bars on the Y-axis are evaluated based on the statistical variation of the measured data.)Display full size Figure 10. Scanning electron microscopy images of yttria-stabilized zirconia (YSZ) sample before and after measurement. (a)Sample holder filled with YSZ powder (before XAFS measurement). (b)After XAFS measurement.Display full size Figure 11 Comparison of temperature calibration results and finite-element method analysis results.Display full sizeAdditional informationFundingThe work was supported by the The Japan MEXT National Problem-Making R&D Promotion Project ”Acceleration of Nuclear Fuel Development Research Incorporating Artificial Intelligence (AI) Technology” for the Nuclear Energy System Research and Development Project. .