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arXiv · 2112.00844

Immobilization of the rare earth fraction in lanthanide phosphates LnPO4. Radiation and hydrolytic resistance of the matrix

D. A. Mikhaylov·E. A. Potanina·V. A. Orlova·M. S. Boldin·A. A. Murashov·A. V. Voronin·A. V. Nokhrin·K. K. Kordhenkin·D. V. Ryabkov·A. I. Orlova·V. N. Chuvildeev
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Abstract

Radiation and hydrolytic resistance of Eu0.054Gd0.014Y0.05La0.111Ce0.2515Pr0.094Nd0.3665Sm0.059PO4 with monazite structure has been studied. The powders were obtained by deposition from solutions. Ceramic specimens with relative density ~97% were obtained by Spark Plasma Sintering (heating rate Vh = 50 {\deg}C/min, sintering temperature Ts = 1070 {\deg}C, sintering time ts = 18 min). Irradiation by accelerated electrons up to dose of 10^9 Ge was found not to result in a destruction of the target phase. After the irradiation, an increasing of the leaching rate by an order of magnitude (up to ~10^{-8} g/(cm2*day)) and a reduction of the mechanical properties by 32% as compared to the non-irradiated ceramic specimen were observed.

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D. A. Mikhaylov, E. A. Potanina, V. A. Orlova, M. S. Boldin, A. A. Murashov, A. V. Voronin, A. V. Nokhrin, K. K. Kordhenkin, D. V. Ryabkov, A. I. Orlova, V. N. Chuvildeev. 2021-12-01. Immobilization of the rare earth fraction in lanthanide phosphates LnPO4. Radiation and hydrolytic resistance of the matrix. https://arxiv.org/abs/2112.00844

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