GADOLINIUM(III) COMPLEX OXIDE COMPOUNDS OF OBTAINED FROM MOLYBDATE-PHOSPHATE MOLTEN SALT
The peculiarities of K2Gd(PO4)(MoO4) single crystal growth from combined phosphate-molybdate melts have been investigated. The formation regions of GdPO4, KGd(MoO4)2 and their cocrystallization fields with the mixed anionic compound potassium – gadolinium have been established. IR...
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| Дата: | 2022 |
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| Автори: | , , , |
| Формат: | Стаття |
| Мова: | Англійська |
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V.I.Vernadsky Institute of General and Inorganic Chemistry
2022
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| Онлайн доступ: | https://ucj.org.ua/index.php/journal/article/view/472 |
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| Назва журналу: | Ukrainian Chemistry Journal |
Репозитарії
Ukrainian Chemistry Journal| _version_ | 1856543796771160064 |
|---|---|
| author | Terebilenko, Kateryna Zozuliia, Valeriia Tokmenko, Inna Slobodyanik, Mykola |
| author_facet | Terebilenko, Kateryna Zozuliia, Valeriia Tokmenko, Inna Slobodyanik, Mykola |
| author_sort | Terebilenko, Kateryna |
| baseUrl_str | |
| collection | OJS |
| datestamp_date | 2022-11-03T13:04:09Z |
| description | The peculiarities of K2Gd(PO4)(MoO4) single crystal growth from combined phosphate-molybdate melts have been investigated. The formation regions of GdPO4, KGd(MoO4)2 and their cocrystallization fields with the mixed anionic compound potassium – gadolinium have been established. IR spectroscopy showed that in all compounds molybdenum and phosphorus are in a tetrahedral environment, and the phase composition was confirmed by X-ray powder. Crystallization of the target compound K2Gd(PO4)(MoO4) is observed in the pseudobinary section K2Mo2O7-KPO3 orthiorombic system, space group Ibca, Z = 8, а = 19,694(4) Å, b = 12,260(3) Å, c = 6,961(3) Å. Double phosphate K3Gd(PO4)2 crystallizes in the form of colorless prismatic crystals from the melts with the initial ratio K/P = 1.7–3.3, which practically corresponds to the section K2MoO4 – K4P2O7. Phosphate GdPO4 crystallizes in the form of colorless prismatic crystals up to 0.1 mm in size at the maximum KPO3 content in the melt, which corresponds to K/P ratio = 0.20–0.50 and K/(Mo+P) = 0.25–0.33. Crystal-chemical criteria for the formation of mixed-anion-type layered frameworks, island structures, and three-dimensional frameworks based on mixed phosphate-molybdate systems and rare earth elements are proposed. The key factor in the formation of complex oxide compounds of rare earth elements from combined molybdate-phosphate melts is the ratio of K/Mo in the initial solution - melt: 1) at K/Mo = 0.5–1.1, LnPO4 orthophosphates are formed, which are characterized by a 3D framework on the basis of LnO7/LnO8polyhedra condensed into a three-dimensional framework; at K/Mo = 1.2–1.5, mixed anionic compounds of the composition K2Ln(PO4)(MoO4) (Ln – Gd- Tb) with a layered structure are formed, where LnО8 forms zigzag chains; 3) at K/Mo = 1.6–3.0, double orthophosphates of the composition K3Ln(PO4)2 with an island structure are formed. |
| first_indexed | 2025-09-24T17:43:46Z |
| format | Article |
| id | oai:ojs2.1444248.nisspano.web.hosting-test.net:article-472 |
| institution | Ukrainian Chemistry Journal |
| language | English |
| last_indexed | 2025-09-24T17:43:46Z |
| publishDate | 2022 |
| publisher | V.I.Vernadsky Institute of General and Inorganic Chemistry |
| record_format | ojs |
| spelling | oai:ojs2.1444248.nisspano.web.hosting-test.net:article-4722022-11-03T13:04:09Z GADOLINIUM(III) COMPLEX OXIDE COMPOUNDS OF OBTAINED FROM MOLYBDATE-PHOSPHATE MOLTEN SALT Terebilenko, Kateryna Zozuliia, Valeriia Tokmenko, Inna Slobodyanik, Mykola gadolinium, molybdenum, phosphate, melt, crystallization field. The peculiarities of K2Gd(PO4)(MoO4) single crystal growth from combined phosphate-molybdate melts have been investigated. The formation regions of GdPO4, KGd(MoO4)2 and their cocrystallization fields with the mixed anionic compound potassium – gadolinium have been established. IR spectroscopy showed that in all compounds molybdenum and phosphorus are in a tetrahedral environment, and the phase composition was confirmed by X-ray powder. Crystallization of the target compound K2Gd(PO4)(MoO4) is observed in the pseudobinary section K2Mo2O7-KPO3 orthiorombic system, space group Ibca, Z = 8, а = 19,694(4) Å, b = 12,260(3) Å, c = 6,961(3) Å. Double phosphate K3Gd(PO4)2 crystallizes in the form of colorless prismatic crystals from the melts with the initial ratio K/P = 1.7–3.3, which practically corresponds to the section K2MoO4 – K4P2O7. Phosphate GdPO4 crystallizes in the form of colorless prismatic crystals up to 0.1 mm in size at the maximum KPO3 content in the melt, which corresponds to K/P ratio = 0.20–0.50 and K/(Mo+P) = 0.25–0.33. Crystal-chemical criteria for the formation of mixed-anion-type layered frameworks, island structures, and three-dimensional frameworks based on mixed phosphate-molybdate systems and rare earth elements are proposed. The key factor in the formation of complex oxide compounds of rare earth elements from combined molybdate-phosphate melts is the ratio of K/Mo in the initial solution - melt: 1) at K/Mo = 0.5–1.1, LnPO4 orthophosphates are formed, which are characterized by a 3D framework on the basis of LnO7/LnO8polyhedra condensed into a three-dimensional framework; at K/Mo = 1.2–1.5, mixed anionic compounds of the composition K2Ln(PO4)(MoO4) (Ln – Gd- Tb) with a layered structure are formed, where LnО8 forms zigzag chains; 3) at K/Mo = 1.6–3.0, double orthophosphates of the composition K3Ln(PO4)2 with an island structure are formed. 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/472 10.33609/2708-129X.88.08.2022.59-65 Ukrainian Chemistry Journal; Vol. 88 No. 8 (2022): Ukrainian Chemistry Journal; 59-65 Украинский химический журнал; Том 88 № 8 (2022): Ukrainian Chemistry Journal; 59-65 Український хімічний журнал; Том 88 № 8 (2022): Український хімічний журнал; 59-65 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/472/241 |
| spellingShingle | Terebilenko, Kateryna Zozuliia, Valeriia Tokmenko, Inna Slobodyanik, Mykola GADOLINIUM(III) COMPLEX OXIDE COMPOUNDS OF OBTAINED FROM MOLYBDATE-PHOSPHATE MOLTEN SALT |
| title | GADOLINIUM(III) COMPLEX OXIDE COMPOUNDS OF OBTAINED FROM MOLYBDATE-PHOSPHATE MOLTEN SALT |
| title_full | GADOLINIUM(III) COMPLEX OXIDE COMPOUNDS OF OBTAINED FROM MOLYBDATE-PHOSPHATE MOLTEN SALT |
| title_fullStr | GADOLINIUM(III) COMPLEX OXIDE COMPOUNDS OF OBTAINED FROM MOLYBDATE-PHOSPHATE MOLTEN SALT |
| title_full_unstemmed | GADOLINIUM(III) COMPLEX OXIDE COMPOUNDS OF OBTAINED FROM MOLYBDATE-PHOSPHATE MOLTEN SALT |
| title_short | GADOLINIUM(III) COMPLEX OXIDE COMPOUNDS OF OBTAINED FROM MOLYBDATE-PHOSPHATE MOLTEN SALT |
| title_sort | gadolinium(iii) complex oxide compounds of obtained from molybdate-phosphate molten salt |
| topic_facet | gadolinium molybdenum phosphate melt crystallization field. |
| url | https://ucj.org.ua/index.php/journal/article/view/472 |
| work_keys_str_mv | AT terebilenkokateryna gadoliniumiiicomplexoxidecompoundsofobtainedfrommolybdatephosphatemoltensalt AT zozuliiavaleriia gadoliniumiiicomplexoxidecompoundsofobtainedfrommolybdatephosphatemoltensalt AT tokmenkoinna gadoliniumiiicomplexoxidecompoundsofobtainedfrommolybdatephosphatemoltensalt AT slobodyanikmykola gadoliniumiiicomplexoxidecompoundsofobtainedfrommolybdatephosphatemoltensalt |