Abstract
"The lattice deformations in two doped fluorite systems, (U1-xGdx)O2.00 and (Th1‑xGdx)O2-x/2, have been reassessed by precise X-ray and electron diffraction investigations and the results were interpreted using the Bond Valence Sum (BVS) approach. For the (U1-xGdx)O2.00 system, the experimental findings and theoretical assessment confirm earlier work: the lattice keeps its fluorite structure with a unit cell parameter that contracts linearly with dopant concentration. The lattice contraction in the (Th1‑xGdx)O2-x/2 system has for the first time been analyzed up to the solubility limit. Similar as for (U1-xGdx)O2.00, the (Th1‑xGdx)O2-x/2 solid solution contracts linearly as a function of dopant concentration but additionally, it develops a superstructure which is closely related to the parent fluorite structure. An excess anion bixbyite trial model is proposed to describe this superstructure."
Original language | English |
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Pages (from-to) | 135-143 |
Number of pages | 9 |
Journal | Journal of Nuclear Materials |
Volume | 467 |
Issue number | 1 |
DOIs | |
State | Published - 14 Sep 2015 |