THE INFLUENCE OF THE PRECURSOR COMPOSITION ON THE PECULIARITIES OF THE BARIUM TITANATE FORMATION
In the process of obtaining barium titanate by the Pechini method, a connection between the conditions of complexes precipitation and the nature of their thermal decomposition was established. X-ray phase analysis of thermally decomposed precursors showed that the formation of a single-phase system...
Збережено в:
| Дата: | 2022 |
|---|---|
| Автор: | |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
V.I.Vernadsky Institute of General and Inorganic Chemistry
2022
|
| Онлайн доступ: | https://ucj.org.ua/index.php/journal/article/view/473 |
| Теги: |
Додати тег
Немає тегів, Будьте першим, хто поставить тег для цього запису!
|
| Назва журналу: | Ukrainian Chemistry Journal |
Репозитарії
Ukrainian Chemistry Journal| id |
oai:ojs2.1444248.nisspano.web.hosting-test.net:article-473 |
|---|---|
| record_format |
ojs |
| spelling |
oai:ojs2.1444248.nisspano.web.hosting-test.net:article-4732022-11-03T13:03:46Z THE INFLUENCE OF THE PRECURSOR COMPOSITION ON THE PECULIARITIES OF THE BARIUM TITANATE FORMATION Kovalenko, Olha barium titanate, oxalate method, stoichiometry, nanoparticles. In the process of obtaining barium titanate by the Pechini method, a connection between the conditions of complexes precipitation and the nature of their thermal decomposition was established. X-ray phase analysis of thermally decomposed precursors showed that the formation of a single-phase system based on barium titanate can be achieved in the range of Ba/Ti ratio 0.96-1.01 at high reagent concentration and low solution pH during the precursor deposition process. On the basis of thermogravimetric analysis, a possible mechanism of precursor decomposition and its composition is assumed. It is shown that the number of hydroxide groups in the structure affects the crystallization mechanism, total mass loss, and the amount of water adsorbed on the surface. In particular, samples obtained at low solution pH have a minimal amount of hydroxyl groups and decompose according to a typical four-step mechanism of thermal decomposition of barium titanyl oxalate. Other samples contain hydro and carbo groups, which leads to an increase in the final decomposition temperature above 770 °C and a multistage decomposition process due to the difference in the activation energy of the nucleation of different phases. This, in turn, may determine the dominance of the nucleation process over the growth and nucleation of smaller crystallites, compared to the product of pure oxalate decomposition. On the one hand, the high content of chloride ions at the lowest pH promotes the crystallization of the product and the formation of additional nucleation centers from the phase of amorphous titanium dioxide. On the other hand, the formation of smaller crystallites occurs due to the absence of significant particle collisions in conditions of low concentration of the solution. On the basis of thermogravimetric analysis, it is shown that at high concentration, barium titanyl oxalate decomposes mainly by the mechanism of formation of intermediate oxycarbonates, and not barium carbonate and titanium dioxide. Thus, the optimization of the precursor precipitation parameters and the study of the barium titanate formation mechanism allow for better regulation of the composition and crystallite size of the final product. V.I.Vernadsky Institute of General and Inorganic Chemistry 2022-09-26 Article Article Inorganic Chemistry Неорганическая химия Неорганічна хімія application/pdf https://ucj.org.ua/index.php/journal/article/view/473 10.33609/2708-129X.88.08.2022.66-78 Ukrainian Chemistry Journal; Vol. 88 No. 8 (2022): Ukrainian Chemistry Journal; 66-78 Украинский химический журнал; Том 88 № 8 (2022): Ukrainian Chemistry Journal; 66-78 Український хімічний журнал; Том 88 № 8 (2022): Український хімічний журнал; 66-78 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/473/242 |
| institution |
Ukrainian Chemistry Journal |
| baseUrl_str |
|
| datestamp_date |
2022-11-03T13:03:46Z |
| collection |
OJS |
| language |
English |
| topic_facet |
barium titanate oxalate method stoichiometry nanoparticles. |
| format |
Article |
| author |
Kovalenko, Olha |
| spellingShingle |
Kovalenko, Olha THE INFLUENCE OF THE PRECURSOR COMPOSITION ON THE PECULIARITIES OF THE BARIUM TITANATE FORMATION |
| author_facet |
Kovalenko, Olha |
| author_sort |
Kovalenko, Olha |
| title |
THE INFLUENCE OF THE PRECURSOR COMPOSITION ON THE PECULIARITIES OF THE BARIUM TITANATE FORMATION |
| title_short |
THE INFLUENCE OF THE PRECURSOR COMPOSITION ON THE PECULIARITIES OF THE BARIUM TITANATE FORMATION |
| title_full |
THE INFLUENCE OF THE PRECURSOR COMPOSITION ON THE PECULIARITIES OF THE BARIUM TITANATE FORMATION |
| title_fullStr |
THE INFLUENCE OF THE PRECURSOR COMPOSITION ON THE PECULIARITIES OF THE BARIUM TITANATE FORMATION |
| title_full_unstemmed |
THE INFLUENCE OF THE PRECURSOR COMPOSITION ON THE PECULIARITIES OF THE BARIUM TITANATE FORMATION |
| title_sort |
influence of the precursor composition on the peculiarities of the barium titanate formation |
| description |
In the process of obtaining barium titanate by the Pechini method, a connection between the conditions of complexes precipitation and the nature of their thermal decomposition was established. X-ray phase analysis of thermally decomposed precursors showed that the formation of a single-phase system based on barium titanate can be achieved in the range of Ba/Ti ratio 0.96-1.01 at high reagent concentration and low solution pH during the precursor deposition process. On the basis of thermogravimetric analysis, a possible mechanism of precursor decomposition and its composition is assumed. It is shown that the number of hydroxide groups in the structure affects the crystallization mechanism, total mass loss, and the amount of water adsorbed on the surface. In particular, samples obtained at low solution pH have a minimal amount of hydroxyl groups and decompose according to a typical four-step mechanism of thermal decomposition of barium titanyl oxalate. Other samples contain hydro and carbo groups, which leads to an increase in the final decomposition temperature above 770 °C and a multistage decomposition process due to the difference in the activation energy of the nucleation of different phases. This, in turn, may determine the dominance of the nucleation process over the growth and nucleation of smaller crystallites, compared to the product of pure oxalate decomposition. On the one hand, the high content of chloride ions at the lowest pH promotes the crystallization of the product and the formation of additional nucleation centers from the phase of amorphous titanium dioxide. On the other hand, the formation of smaller crystallites occurs due to the absence of significant particle collisions in conditions of low concentration of the solution. On the basis of thermogravimetric analysis, it is shown that at high concentration, barium titanyl oxalate decomposes mainly by the mechanism of formation of intermediate oxycarbonates, and not barium carbonate and titanium dioxide. Thus, the optimization of the precursor precipitation parameters and the study of the barium titanate formation mechanism allow for better regulation of the composition and crystallite size of the final product. |
| publisher |
V.I.Vernadsky Institute of General and Inorganic Chemistry |
| publishDate |
2022 |
| url |
https://ucj.org.ua/index.php/journal/article/view/473 |
| work_keys_str_mv |
AT kovalenkoolha theinfluenceoftheprecursorcompositiononthepeculiaritiesofthebariumtitanateformation AT kovalenkoolha influenceoftheprecursorcompositiononthepeculiaritiesofthebariumtitanateformation |
| first_indexed |
2025-09-24T17:43:46Z |
| last_indexed |
2025-09-24T17:43:46Z |
| _version_ |
1849658122998644736 |