Polycrystalline uranium-bearing compounds Y6U1O12, Gd6U1O12, Ho6U1O12, Yb6U1O12, and Lu6U1O12 samples were irradiated with various ions species (300 keV Kr, 400 keV Ne, and 100 keV He) at cryogenic temperature ( 100K), and the microstructures were examined following irradiation using grazing incidence X-ray diffraction and transmission electron microscopy. The pristine samples are characterized...

Entropy-stabilized fluorite oxides having multifunctional properties.

A millimeter-sized fluorite crystal found in leucocratic syenite of the Velykovyska massif on Ukrainian Shield became object study. This is a irregular shape with smoothed corners, broken by system contraction cracks inlaid basnäsite-(Ce). The latter characterized REE content 57± 5 wt. %, CaO - 3.3 ± 0.25 % and Ce2O3 : La2O3 Nd2O3 ratio 6 4 1. detailed study using microprobe JXA-733 an electron...

The present work reports on the synthesis of cellulose acetate (CA) asymmetric membranes with the incorporation of inorganic fluorides, CaF2 particles. These fillers of polymeric composites can, according to the literature, promote the ordering of the polymer matrix, which can lead to interesting permeation properties. In order to achieve that, fluorite (CaF2 ) fine particles were prepared by a...

The catalytic properties of mixed oxides with the fluorite or pyrochlore structure were investigated using CO oxidation. The presence of ions with a variable valence state, the size of the ions and especially the extent of pyrochlore ordering affect kinetic behaviour and activity of the investigated materials.