ORALS
SESSION:
GeochemistryWedPM2-R8
| Navrotsky International Symposium (2nd Intl. Symp. on Geochemistry for Sustainable Development) |
| Wed. 29 Nov. 2023 / Room: Coral Reef | |
| Session Chairs: Qijun Hong; Session Monitor: TBA |
16:00: [GeochemistryWedPM209] OS
NOVEL INSIGHT INTO DEFECT BEHAVIOR OF IRRADIATED MATERIALS - COMBINED NEUTRON TOTAL SCATTERING AND HIGH TEMPERATURE CALORIMETRY INVESTIGATION Maik Lang1 ;
1University of Tennessee, Knoxville, United States;
Paper Id: 97
[Abstract] We present neutron total scattering combined with high-temperature calorimetry as a new strategy for the characterization of radiation effects in materials. Irradiation experiments were performed at the GSI Helmholtz Center with heavy ions of specific energy of 11.4 MeV/u. The use of such ions (penetration depth: ~100 μm) produces the sufficiently large irradiated sample mass (~150 mg) required for bulk structural and thermodynamic analysis. Neutron scattering was performed at the Nanoscale Ordered Materials Diffractometer at the Spallation Neutron Source (Oak Ridge National Laboratory). High temperature oxide melt solution calorimetry and differential scanning calorimetry was utilized to investigate the thermodynamic properties and energetic evolution using the same set of irradiated samples. We studied various ion-induced structural modifications [1-5], such as defect formation (CeO2), disordering (Er2Sn2O7), and amorphization (Dy2Ti2O7). Our analytical approach demonstrated that irradiation-induced modifications are more complex than previously thought with distinct processes occurring over different length scales and temperature regimes.
References:
[1] M. Zhao, E. O’Quinn, N. Birkner, Y. Xu, M. Lang, K. Brinkman, Radiation damage and thermal annealing in tunnel structured hollandite materials, Acta Materialia 206, 116598 (2021).
[2] C.K. Chung, E.C. O'Quinn, J. Neuefeind, A.F. Fuentes, H. Xu, M. Lang, A. Navrotsky, Thermodynamics and structural evolution of mechanically milled and swift heavy ion irradiated Er2Ti2O7 pyrochlore, Acta Materialia 181, 309-317 (2019).
[3] A. Shelyug, R. I. Palomares, M. Lang, and A. Navrotsky, Energetics of defect production in fluorite-structured CeO2 induced by highly ionizing radiation, Physical Review Materials 2, 093607 (2018).
[4] C.K. Chung, M. Lang, H.W. Xu, and A. Navrotsky, Thermodynamic of radiation induced amorphization and thermal annealing of Dy2Sn2O7 pyrochlore, Acta Materialia 155, 386-392 (2018).
[5] C.K. Chung, J. Shamblin, E.C. O'Quinn, A. Shelyug, I. Gussev, M. Lang, A. Navrotsky, Thermodynamic and structural evolution of Dy2Ti2O7 pyrochlore after SHI irradiation, Acta Materialia 145, 227-234 (2018).
