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@ARTICLE{Reissner:434577,
author = {Reissner, Claudia E. and Bismayer, Ulrich and Kern, Daniel
and Reissner, Michael and Park, Sulgiye and Zhang, Jiaming
and Ewing, Rodney C. and Shelyug, Anna and Navrotsky,
Alexandra and Paulmann, Carsten and Škoda, Radek and Groat,
Lee A. and Pöllmann, Herbert and Beirau, Tobias},
title = {{M}echanical and structural properties of radiation-damaged
allanite-({C}e) and the effects of thermal annealing},
journal = {Physics and chemistry of minerals},
volume = {46},
number = {10},
issn = {1432-2021},
address = {Heidelberg},
publisher = {Springer},
reportid = {PUBDB-2020-00154},
pages = {921 - 933},
year = {2019},
note = {© Springer-Verlag GmbH Germany},
abstract = {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 maximum radiation dose 3.5 ×
1018 α-decay/g; LB-1: ~1.18 $wt\%$ ThO2, 19.4 $wt\%$ REE
oxides, and maximum radiation dose 2.0 × 1019 α-decay/g;
R1: ~ 1.6 $wt\%$ ThO2, 19.7 $wt\%$ REE oxides, and maximum
radiation dose 2.6 × 1018 α-decay/g) were step-wise
annealed to 1000 K in air. Using orientation-dependent
nanoindentation, synchrotron single-crystal X-ray
diffraction (synchrotron XRD), X-ray powder diffraction
(powder XRD), differential scanning calorimetry and
thermogravimetric analysis (DSC/TG), mass spectrometry (MS),
57Fe Mössbauer spectroscopy and high-resolution
transmission electron microscopy (HRTEM), a comprehensive
understanding of the structural processes involved in the
annealing was obtained. As a result of the overall
increasing structural order, a general increase of hardness
(pristine samples: 8.2–9.3 GPa, after annealing at
1000 K: 10.2–12 GPa) and elastic modulus (pristine
samples: 115–127 GPa, after annealing at 1000 K:
126–137 GPa) occurred. The initially heterogeneous
recrystallization process is accompanied by oxidation of
iron, the related loss of hydrogen and induced stress fields
in the bulk material, which cause internal and surface
cracking after stepwise annealing from 800 to 1000 K. HRTEM
imaging of the pristine material shows preserved
nanometer-sized crystalline domains embedded in the
amorphous matrix, despite the high degree of structural
damage. The results show that hardness and elastic modulus
are sensitive indicators for the structural reorganization
process},
cin = {DOOR ; HAS-User / FS-PET-S},
ddc = {530},
cid = {I:(DE-H253)HAS-User-20120731 /
I:(DE-H253)FS-PET-S-20190712},
pnm = {6213 - Materials and Processes for Energy and Transport
Technologies (POF3-621)},
pid = {G:(DE-HGF)POF3-6213},
experiment = {EXP:(DE-H253)D-F1-20150101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000498338600003},
doi = {10.1007/s00269-019-01051-z},
url = {https://bib-pubdb1.desy.de/record/434577},
}