Synthesis under Hydrothermal Conditions and Structural Transformations of Nanocrystals in the LaPO4-YPO4-(H2O) System Full article
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Наносистемы: физика, химия, математика = Nanosystems: physics, chemistry, mathematics
ISSN: 2220-8054 , E-ISSN: 2305-7971 |
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| Output data | Year: 2023, Volume: 14, Number: 6, Pages: 660-671 Pages count : 12 DOI: 10.17586/2220-8054-2023-14-6-660-671 | ||||||
| Tags | nanocrystals, monazite, xenotime, rhabdophane, structural transformations, yttrium phosphate, lanthanum phosphate | ||||||
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Funding (1)
| 1 | Russian Science Foundation | 21-13-00260 (121120700359-7) |
Abstract:
Structural transformations of nanocrystals in the LaPO4–YPO4–(H2O) oxide system were investigated under hydrothermal conditions at 230∘C, 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 230∘C, 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 230∘C.
Cite:
Enikeeva M.O.
, Proskurina O.V.
, Gerasimov E.Y.
, Nevedomskiy V.N.
, Gusarov V.V.
Synthesis under Hydrothermal Conditions and Structural Transformations of Nanocrystals in the LaPO4-YPO4-(H2O) System
Наносистемы: физика, химия, математика = Nanosystems: physics, chemistry, mathematics. 2023. V.14. N6. P.660-671. DOI: 10.17586/2220-8054-2023-14-6-660-671 WOS Scopus РИНЦ OpenAlex
Synthesis under Hydrothermal Conditions and Structural Transformations of Nanocrystals in the LaPO4-YPO4-(H2O) System
Наносистемы: физика, химия, математика = Nanosystems: physics, chemistry, mathematics. 2023. V.14. N6. P.660-671. DOI: 10.17586/2220-8054-2023-14-6-660-671 WOS Scopus РИНЦ OpenAlex
Dates:
| Submitted: | Oct 10, 2023 |
| Accepted: | Nov 16, 2023 |
| Published online: | Dec 30, 2023 |
Identifiers:
| Web of science: | WOS:001137162800004 |
| Scopus: | 2-s2.0-85181728145 |
| Elibrary: | 57597726 |
| OpenAlex: | W4390466731 |