Modern Problems of Materials Science
Influence of MoO3 and HfO2 Particle Size on the Phase Composition and Density of Dysprosium Hafnate Pellets
Igor Chernov (ic1882377@gmail.com)1, Victor Romankov1, Serhii Malykhin2, Igor Kolodiy3, Olexandr Kalchenko3
1. “Nuclear Fuel Cycle” Science and Technology Establishment of National Science Center “Kharkiv Institute of Physics and Technology”
2. National Technical University “Kharkiv Polytechnic Institute”
3. Institute of Solid State Physics, Materials Science and Technologies of National Science Center “Kharkiv Institute of Physics and Technology”
PDFKeywords
dysprosium hafnate, density, powder, pellet, phase
Abstract
The results of studies of the influence of the MoO3 alloying additive, as well as HfO2 with different particle sizes on the phase composition and density of dysprosium hafnate pellets are presented. It is shown that the use of coarse HfO2 powder (ГФО-2 grade) with particles size from 1 to 100 µm does not lead to the achievement of high density of sintered pellets and the completeness of the dysprosium hafnate synthesis, since dysprosium oxide remains in the synthesized material at sintering temperature of 1650°C. The use of HfO2 manufactured by China Rare Metal Material with a crystallite size near 22 nm leads to anbugz increase in the sintered pellets density (8.2…8.3) g/cm3. The doping of MoO3 in the amount of 2.5 wt%. promotes the intensification of synthesis process with the formation of a single-phase fluorite structure at a temperature of 1450°C, but does not increase the density of sintered pellets.