Registration Number
0224U033579,
(0123U103024)
, R & D reports
Title
Synthesis and investigation of nanoscale functional materials for energy-generating and energy-saving systems
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Синтез та дослідження літій-провідних, магнітних та органо-неорганічних матеріалів
Head
Torchyniuk Pavlo V., Кандидат хімічних наук
Registration Date
31-12-2024
Organization
Institute of General and Inorganic Chemistry. VI Vernadsky National Academy of Sciences of Ukraine
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The purpose of this project is to study the properties of lithium-conductive, magnetic, and organic-inorganic materials and to create composite elements based on them for various purposes for energy-saving and energy-generating systems.
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It was found that regardless of the ratio of PbI2:CH3NH3І (1:1, 1:2, 1:3) the formation of perovskite CH3NH3PbI3 occurs through the formation and decomposition of 4 intermediate compounds. At a ratio of 1:1 in DMSO, a single-phase perovskite film is not formed, small amounts of the intermediate compound (CH3NH3)2(DMSO)2Pb3I8 are always present. At a ratio of 1:2, and 1:3, a single-phase perovskite film is formed at 190 and 205 °C, respectively.
The effect of the substrate rotation speed on the phase composition of the films was studied. It was found that changing the substrate rotation speed when obtaining perovskite films, regardless of the ratio of the starting reagents, does not affect the number of phases but affects their content in the film. The effect of moisture and oxygen on the stability of CH3NH3PbI3 films obtained with a ratio of starting reagents 1:2, 1:3 in DMSO solvent for 150 days was investigated. It was found that the stability of perovskite films (1:3) to the action of moisture and oxygen is slightly higher than for films (1:2) for 150 days.
Detailed studies of phase transformations that occur during the synthesis of lithium-conducting material Li1.3Al0.3Ti1.7(PO4)3 with the NASICON structure were carried out by solid-phase reactions and sol-gel methods in an air atmosphere. The optimal conditions for the synthesis of this compound were established. To obtain single-phase Li1.3Al0.3Ti1.7(PO4)3 by the TFR method, it is necessary to carry out heat treatment of the charge for 1 h at a temperature of 850 °C, while the sol-gel method allows to reduce the temperature of the final heat treatment by 100 ℃.
It is shown that in the synthesis of La0.67LixTi1-xAlxO3 by the solid-state reaction method, the intermediate phases are La(OH)3, La2O2CO3, Li2TiO3, Li2Ti2O5, Li2Ti3O7, and La2Ti2O7. It is established that using Al(NO3)3 solution instead of Al2O3 in the synthesis reduces the sintering temperature, reduces the loss of volatile elements, and slightly inc
Product Description
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Lisovskyi Ivan V.
Torchyniuk Pavlo V.
Fedorchuk Oleksandr P.
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2024-12-31
