METHOD FOR PREPARING DYSPROSIUM HAFNATE POWDER FOR ABSORBING ELEMENTS OF NUCLEAR REACTOR Russian patent published in 2019 - IPC G21G7/00 G21C7/24 

FIELD: physics; chemistry.

SUBSTANCE: invention relates to nuclear engineering, in particular to neutron-absorbing materials (dysprosium hafnate, Dy₂HfO₅), and can be used in control rods of nuclear reactors. Method includes obtaining dysprosium hafnate powder by mechanical activation of a mixture of components - hafnium dioxide - HfO₂ and dysprosium oxide - Dy₂O₃, taken in an equimolar ratio of 63.9 % by weight of dysprosium oxide and 36.1 % by weight of hafnium oxide, in a planetary ball mill in an argon atmosphere, obtaining composite powder by mechanical activation of a mixture of oxides of dysprosium and hafnium, taken in equimolar ratio, in a spherical planetary mill in an argon atmosphere at a speed of rotation of the planetary disk of 900 rpm, the speed of rotation of the drums - 1500 rpm, with a ratio of the mass of the balls to the mass of the mixture 45:1 in an argon atmosphere at P=4 atm for 40–60 minutes, the resulting powder of hafnate dysprosium is a single-phase ceramic composition of the composition Dy₂HfO₅ with a fluorite structure and a particle size of 15–80 nm.

EFFECT: invention allows the manufacture of chemically active nanodispersed powders of dysprosium hafnate of a stable composition with a higher density after vibrocompaction, reduced temperature and synthesis time.

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