Synthesis under hydrothermal conditions and structural transformations of nanocrystals in the LaPO4–YPO4–(H2O) system
https://doi.org/10.17586/2220-8054-2023-14-6-660-671
Abstract
Structural transformations of nanocrystals in the LaPO4–YPO4–(H2O) oxide system were investigated under hydrothermal conditions at 230C, depending on isothermal holding times (2 hours, 7 days and 28 days). It was shown that before hydrothermal processing, phases crystallize in the system with rhabdophane structures La1-xYxPO4 nH2O (0 x 0:80) and xenotime YPO4. It has been determined that increasing the duration of isothermal treatment under hydrothermal conditions leads to the transformation of the rhabdophane phase into phases with monazite and equilibrium xenotime structures, with an intermediate crystallization of the metastable monazite phase. It is noted that only after 28 days of hydrothermal treatment at 230C, the system approaches the equilibrium composition of the phases with monazite structures La0:97Y0:03PO4 (with crystal sizes of 18–50 nm) and xenotime YPO4 (with crystal sizes of 45–90 nm). In a single-phase sample with a monazite structure La0:75Y0:25PO4, the average crystal size remains unchanged at around 20 nm after 2 hours, 7 days and 28 days of hydrothermal treatment at 230C.
Keywords
nanocrystals,
monazite,
xenotime,
rhabdophane,
structural transformations,
yttrium phosphate,
lanthanum phosphate
Supporting agencies: Powder XRD measurements, Rietveld refinement of crystal structures and EDX analysis have been carried out with using the equipment and software of the Engineering Department of the St. Petersburg State University of Technology (Technical University). TEM investigations carried out with using the equipment of the Joint Research Center ’Materials science and characterization in advanced technology’ (Ioffe Institute, St. Petersburg) and HRTEM study was carried out using the facilities of the “National center of investigation of catalysts” at Boreskov lnstitute of Catalysis. The present work of M.O.E., O.V.P. and V.V.G. was supported by the Russian Science Foundation (project no. 21-13-00260).
About the Authors
M. O. Enikeeva
Ioffe Institute; St. Petersburg State Institute of Technology
Russian Federation
Russian Federation
Maria O. Enikeeva
194021 St. Petersburg
190013 St. Petersburg
O. V. Proskurina
Ioffe Institute; St. Petersburg State Institute of Technology
Russian Federation
Russian Federation
Olga V. Proskurina
194021 St. Petersburg
190013 St. Petersburg
E. Yu. Gerasimov
Federal Research Center, Boreskov Institute of Catalysis SB RAS
Russian Federation
Russian Federation
Evgeny Yu. Gerasimov
Novosibirsk 630090
V. N. Nevedomskiy
Ioffe Institute
Russian Federation
Russian Federation
Vladimir N. Nevedomskiy
194021 St. Petersburg
V. V. Gusarov
Ioffe Institute
Russian Federation
Russian Federation
Victor V. Gusarov
194021 St. Petersburg
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Enikeeva M.O., Proskurina O.V., Gerasimov E.Yu., Nevedomskiy V.N., Gusarov V.V. Synthesis under hydrothermal conditions and structural transformations of nanocrystals in the LaPO4–YPO4–(H2O) system. Nanosystems: Physics, Chemistry, Mathematics. 2023;14(6):660-671. https://doi.org/10.17586/2220-8054-2023-14-6-660-671
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