SYNTHESIS AND CRYSTAL STRUCTURE OF A NEW MICROPOROUS SILICATE WITH A MIXED OCTAHEDRAL-TETRAHEDRAL FRAMEWORK: CS3SCSI8O19
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dc.contributor.author | Kolitsch U. | |
dc.contributor.author | Tillmanns E. | |
dc.date.accessioned | 2022-04-17T09:21:26Z | |
dc.date.available | 2022-04-17T09:21:26Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=14416815 | |
dc.identifier.citation | Mineralogical Magazine, 2004, 68, 4, 687-697 | |
dc.identifier.issn | 0026-461X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/37169 | |
dc.description.abstract | During investigations of the system Sc2O3-Al2O3-TiO2-SiO2, a new, unusual microporous compound, Cs3ScSi8O19, was synthesized as colourless plates from a CsF-MoO3 flux. The crystal structure was determined from single-crystal X-ray diffraction data (Mo-Kα radiation, CCD area detector). The compound is orthorhombic, space group Pnma, with a = 11.286(2), b = 7.033(1), c = 26.714(5) Å, and Z = 4 (R1(F) = 2.6% and wR2all(F 2) = 7.3%, using 3066 ‘observed’ reflections with Fo > 4σ(F o)). The crystal structure of Cs3ScSi8O19 represents a new microporous framework structure type (‘MCV-1’), and the compound is exceptional in being the first representative of a mixed octahedral-tetrahedral framework structure, in which the [TO4]:[MO6] ratio is >6:1. The structure is based on isolated, nearly regular ScO6 octahedra [d av(Sc—O) = 2.112 Å] sharing corners with SiO4 tetrahedra to form an open framework with four-, six- and eight-membered rings; the latter are formed by SiO4 tetrahedra only. Two fully occupied Cs positions are located in large framework voids close to the six-membered rings, whereas four partly occupied and disordered Cs positions are close to very large framework voids bordered by the puckered eight-membered rings. The cavities are linked into channels parallel to [100] and [010]. The structure is compared with that of Cs2TiSi6O15 and related microporous scandium-, REE-, titano- and zirconosilicate minerals and compounds. Cs3ScSi8O19 or derivatives may be important in the context of immobilization of radioactive 137Cs waste, cationic conductivity or catalysis. | |
dc.title | SYNTHESIS AND CRYSTAL STRUCTURE OF A NEW MICROPOROUS SILICATE WITH A MIXED OCTAHEDRAL-TETRAHEDRAL FRAMEWORK: CS3SCSI8O19 | |
dc.type | Статья |
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