Phase formation and thermal analysis in the LaPO4–GdPO4–H2O system
M. O. Enikeeva,
K. A. Zhidomorova,
D. P. Danilovich,
V. N. Nevedomskiy,
O. V. Proskurina,
V. V. Gusarov https://doi.org/10.17586/2220-8054-2024-15-6-781-792
Abstract
Structural transformations of nanocrystals in the LaPO4–GdPO4–(H2O) system under hydrothermal conditions at 230 ◦C were studied depending on the duration of isothermal holding (2 hours, 3 days, and 5 days). It has been shown that a phase with the rhabdophane-like structure, La1−xGdxPO4*nH2O (0.00≤ x ≤1.00), exhibits a weighted average crystallite size of 4–7 nm and crystallizes in the system prior to hydrothermal treatment. As a result of hydrothermal treatment, samples in the LaPO4–GdPO4–(H2O) system are completely transformed into a phase with a monazite structure within five days, with the slowest transfor- mation observed for gadolinium orthophosphate. It was found that nanoparticles with a rhabdophane structure, GdPO4*nH2O, possess a single-crystal structure. The thermal analysis data indicated that the samples obtained via the precipitation method contain an X-ray amorphous phase and impurity compounds. The onset temperature of the structural transformation from rhabdophane to monazite, as well as the number of water molecules in the rhabdophane-like structure, depends on the chemical composition of the compound, particularly with regard to the isomorphic substitution of lanthanum cations with gadolinium cations.
Supporting agencies: X-ray diffraction studies were carried out in the laboratory of new inorganic materials (Ioffe Institute). Scanning electron microscopy and DTA/TG studies were carried out on the instruments of the Engineering department of the Saint Petersburg State Institute of Technology (Technical University). The work of M.O.E. was carried out with the support of the Russian Science Foundation project No. 24-13-00445.
About the Authors
M. O. Enikeeva
Ioffe Institute; Branch of Petersburg Nuclear Physics Institute named after B. ˙P. Konstantinov of National Research Centre “Kurchatov Institute” – Institute of Silicate Chemistry
Russian Federation
Russian Federation
Maria O. Enikeeva
194021 St. Petersburg
199034, St. Petersburg
K. A. Zhidomorova
Branch of Petersburg Nuclear Physics Institute named after B. ˙P. Konstantinov of National Research Centre “Kurchatov Institute” – Institute of Silicate Chemistry; St. Petersburg State Institute of Technology
Russian Federation
Russian Federation
Kseniya A. Zhidomorova
199034, St. Petersburg
190013, St. Petersburg
D. P. Danilovich
St. Petersburg State Institute of Technology
Russian Federation
Russian Federation
Dmitriy P. Danilovich
190013, St. Petersburg
V. N. Nevedomskiy
Ioffe Institute
Russian Federation
Russian Federation
Vladimir N. Nevedomskiy
194021 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
V. V. Gusarov
Ioffe Institute
Russian Federation
Russian Federation
Victor V. Gusarov
194021 St. Petersburg
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Enikeeva M.O., Zhidomorova K.A., Danilovich D.P., Nevedomskiy V.N., Proskurina O.V., Gusarov V.V. Phase formation and thermal analysis in the LaPO4–GdPO4–H2O system. Nanosystems: Physics, Chemistry, Mathematics. 2024;15(6):781-792. https://doi.org/10.17586/2220-8054-2024-15-6-781-792
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