Partially disordered pyrochlore: time-temperature dependence of recrystallization and dehydration

Autor: Tobias Beirau, Claudia E. Reissner, Herbert Pöllmann, Ulrich Bismayer

Publikováno v: Zeitschrift für Kristallographie - Crystalline Materials. 237:287-291

The comparison of the evolution of the mechanical properties (elastic modulus and hardness) after step-wise thermal annealing for 1 and 16 h up to 900 K of a radiation-damaged pyrochlore (∼35% amorphous fraction; 1.8 wt% ThO2) provides insights to

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ac661a2d05f719a2fe18d63ed99f3b54
https://doi.org/10.1515/zkri-2022-0006

Percolation transitions in pyrochlore: radiation-damage and thermally induced structural reorganization

Autor: Tobias Beirau, Norbert Huber

Publikováno v: Applied Physics Letters 119 (13): 131905 (2021-09-27)
Beirau, T.; Huber, N.: Percolation transitions in pyrochlore: Radiation-damage and thermally induced structural reorganization. In: Applied Physics Letters. Vol. 119 (2021) 13, 131905. (DOI: /10.1063/5.0068685)

Finite element mechanical modeling is used to follow the evolution of the hardness (H), Young's modulus (E), and Poisson's ratio (ν) during the radiation-damage related crystalline-to-amorphous transition in pyrochlore (average main composition Ca2N

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::44b2ade2b9d05d3ba55ca1263faed40e
https://hdl.handle.net/11420/10553

Iron sites in radiation-damaged allanite-(Ce): the effects of thermally induced oxidation and structural reorganization

Autor: Herbert Pöllmann, Claudia E. Reissner, Daniel Kern, Michael Reissner, Tobias Beirau

Publikováno v: Hyperfine Interactions. 241

Radiation-damaged allanite-(Ce) starts to recrystallize at an annealing temperature below 700 K. At the same temperature Fe2+ → Fe3+ oxidation, as well as dehydration occurs. Three radiation-damaged samples (S74 20414: 0.55 wt% ThO2, LB-1: 1.18 wt%

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b423b3e0af3e178f2aac966c9eed436a
https://doi.org/10.1007/s10751-019-1686-4

Mechanical and structural properties of radiation-damaged allanite-(Ce) and the effects of thermal annealing

Autor: Anna Shelyug, Daniel Kern, Carsten Paulmann, Michael Reissner, Herbert Pöllmann, Rodney C. Ewing, Ulrich Bismayer, Claudia E. Reissner, Sulgiye Park, Jiaming Zhang, Lee A. Groat, Radek Škoda, Tobias Beirau, Alexandra Navrotsky

Publikováno v: Physics and chemistry of minerals 46(10), 921-933 (2019). doi:10.1007/s00269-019-01051-z

The onset of thermally induced, heterogeneous structural reorganization of highly radiation-damaged allanite-(Ce) begins at temperatures below 700 K. Three strongly disordered allanite samples (S74 20414: ~ 0.55 wt% ThO2, 22.1 wt% REE oxides, and max

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1ebfa40dbbcdcdbafeb76cb71cddc584
https://bib-pubdb1.desy.de/record/434577

Mechanical and structural response of radiation-damaged pyrochlore to thermal annealing

Autor: Anja Schreiber, Ulrich Bismayer, Herbert Pöllmann, Vladimir Roddatis, Claudia E. Reissner, Tobias Beirau

Publikováno v: Materialia

Nanoindentation has been employed to probe the mechanical properties [indentation hardness (H) and elastic modulus (E)] of radiation-damaged pyrochlore before and after step-wise thermal annealing up to 900 K. Three natural U and/or Th containing sam

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aa016b7d05b703169c815d303c37069a
https://doi.org/10.1016/j.mtla.2020.100950