Synthesis of nanopowders and physicochemical properties of ceramic matrices of the LaPO4–YPO4–(H2O) and LaPO4–HoPO4–(H2O) systems


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Abstract

Sol-gel method was used to synthesize nanosize powders in the LaPO4–YPO4–(H2O) and LaPO4–HoPO4–(H2O) systems. Dense ceramic samples with high microhardness (up to 25 GPa) were formed from these powders by sintering at temperatures of up to 1600°C. The isomorphic capacity of the monoclinic LaPO4 matrix for the second component (yttrium or holmium) simulating radioactive nuclides of the actinide-rare-earth fraction was found to be high. The composites are stable in aqueous solutions, which is indicated by the low concentration of lanthanum and yttrium ions during leaching test (~10–7 g L–1). The results obtained in the study can be used to develop new high-efficiency ceramic matrices for solidification of the actinide-rare-earth fraction of liquid wastes formed in processing of the spent nuclear fuel.

About the authors

V. L. Ugolkov

Grebenshchikov Institute of Silicate Chemistry

Email: la_mez@mail.ru
Russian Federation, nab. Makarova 2, St. Petersburg, 199034

L. P. Mezentseva

Grebenshchikov Institute of Silicate Chemistry

Author for correspondence.
Email: la_mez@mail.ru
Russian Federation, nab. Makarova 2, St. Petersburg, 199034

A. V. Osipov

Grebenshchikov Institute of Silicate Chemistry

Email: la_mez@mail.ru
Russian Federation, nab. Makarova 2, St. Petersburg, 199034

V. F. Popova

Grebenshchikov Institute of Silicate Chemistry

Email: la_mez@mail.ru
Russian Federation, nab. Makarova 2, St. Petersburg, 199034

T. P. Maslennikova

Grebenshchikov Institute of Silicate Chemistry

Email: la_mez@mail.ru
Russian Federation, nab. Makarova 2, St. Petersburg, 199034

A. A. Akatov

St. Petersburg State Technological Institute (Technical University)

Email: la_mez@mail.ru
Russian Federation, Moskovskii pr. 26, St. Petersburg, 190013

V. A. Doil’nitsyn

St. Petersburg State Technological Institute (Technical University)

Email: la_mez@mail.ru
Russian Federation, Moskovskii pr. 26, St. Petersburg, 190013

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