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

Sol-gel method was used to synthesize nanosize powders in the LaPO 4 –YPO 4 –(H 2 O) and LaPO 4 –HoPO 4 –(H 2 O) 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 monoclini...

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Bibliographic Details
Published in:Russian journal of applied chemistry 2017, Vol.90 (1), p.28-33
Main Authors: Ugolkov, V. L., Mezentseva, L. P., Osipov, A. V., Popova, V. F., Maslennikova, T. P., Akatov, A. A., Doil’nitsyn, V. A.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Industrial Chemistry/Chemical Engineering
Inorganic Synthesis and Industrial Inorganic Chemistry
Microhardness
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Summary:Sol-gel method was used to synthesize nanosize powders in the LaPO 4 –YPO 4 –(H 2 O) and LaPO 4 –HoPO 4 –(H 2 O) 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 LaPO 4 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.
ISSN:1070-4272
1608-3296
DOI:10.1134/S1070427217010050