Effect of strontium atoms substitution on the features of two-slab structure of Sr1-xCaxLa2Sc2O7 scandates
| Autor: | O. Nakonechna, Y. A. Titov, Nadezhda Belyavina, M.S. Slobodyanik, Nataliia Strutynska |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
chemistry.chemical_classification Strontium Materials science Base (chemistry) chemistry.chemical_element 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology 01 natural sciences Bond length Crystallography chemistry Phase (matter) 0103 physical sciences Orthorhombic crystal system 0210 nano-technology Solid solution Perovskite (structure) |
| Zdroj: | French-Ukrainian Journal of Chemistry. 9:44-50 |
| ISSN: | 2312-3222 |
| DOI: | 10.17721/fujcv9i1p44-50 |
| Popis: | Effects of substitution of the Strontium atoms with smaller Calcium atoms on the structural features of the Ruddlesden-Popper SrLa2Sc2O7 two-slab compound is established. The crystal structure of orthorhombic Sr0.85Ca0.15La2Sc2O7 phase with maximum degree of substitution was determined by the Rietveld method (Fmmm space group, a = 0.5766(2) nm, b = 0.5743(2) nm, c = 2.0522(7) nm). Comparison of the structural features of SrLa2Sc2O7 and Sr0.85Ca0.15La2Sc2O7 shows that such type of substitution leads to a decrease in the (La,Sr)2 - О2 interblock bond length (from 0.222 (2) nm at x = 0 to 0.215 (1) nm at x = 0.15). The decrease in interblock bond length brings the constitution of the two-dimensional structure Sr1-хCaxLa2Sc2O7 closer to the structure of the three-dimensional perovskite, leads to its instability at х > 0.15 and gives a reason to conclude that this factor causes a limitation of region of the Sr1-хCaxLa2Sc2O7 solid solutions with a slab perovskite-like structure. Presence of such structure changes is the precondition for regulation of structural-dependent features of the materials on the base of scandates alkaline-earth and rare earth metals. |
| Databáze: | OpenAIRE |
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