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9 results

  • Machine Learning Based Precision Orientation and Strain Mapping from 4D Diffraction Datasets

  • Renliang Yuan, Jiong Zhang, Lingfeng He, Jian-Min Zuo
  • Journal:
    / Volume 27 / Issue S1 / August 2021
    Published online by Cambridge University Press:
    30 July 2021, pp. 1276-1278
    Print publication:
    August 2021
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  • Inert Gas Measurement of Single Bubble in CeO2

  • Lingfeng He, Janne Pakarinen, Xianming Bai, Jian Gan, Yongqiang Wang, Anter El-Azab, Todd R. Allen
  • Journal:
    / Volume 21 / Issue S3 / August 2015
    Published online by Cambridge University Press:
    23 September 2015, pp. 751-752
    Print publication:
    August 2015
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  • Annealing-induced lattice recovery in room-temperature xenon irradiated CeO2: X-ray diffraction and electron energy loss spectroscopy experiments

  • Janne Pakarinen, Lingfeng He, Abdel-Rahman Hassan, Yongqiang Wang, Mahima Gupta, Anter El-Azab, Todd R. Allen
  • Journal:
    Journal of Materials Research / Volume 30 / Issue 9 / 14 May 2015
    Published online by Cambridge University Press:
    10 February 2015, pp. 1555-1562
    Print publication:
    14 May 2015

  • A systematic x-ray diffraction (XRD) study was performed on room-temperature Xe-irradiated and postirradiation annealed CeO2. Large scale XRD did not show any additional irradiation-induced phases upon irradiation. Depth profiling the CeO2 (111) diffraction peak over the 150 nm deep Xe-irradiated layer (400 keV, 1 × 1020 Xe/m2) by grazing incidence XRD indicated a lattice expansion at the irradiated layer. Postirradiation annealing (1 h at 1000 °C) in an oxygen-containing environment removed the observed XRD features. Electron energy loss spectroscopy (EELS) was performed for cross-sectional samples before and after postirradiation annealing. EELS showed that the Ce charge state changed from +4 to +3 at the CeO2 surface indicating the presence of O vacancies in both as-irradiated and annealed samples. EELS also indicated that the amount of O vacancies was reduced at the irradiated region by annealing. The experimental results are discussed based on electronic properties of CeO2, annihilation of oxygen vacancies, and evolution of irradiation damage.