Hydrothermal Synthesis and Structure Solution of Na2Ca(CO3)2: 'Synthetic Analogue' of Mineral Nyerereite
| Autor: | Dmitry A. Fursenko, Yurii V. Seryotkin, Vladimir V. Bakakin, Alexander V. Golovin, Nadezhda B. Bolotina, Pavel N. Gavryushkin, Konstantin D. Litasov, Victor G. Thomas |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Mineral
Chemistry Structure (category theory) chemistry.chemical_element 02 engineering and technology General Chemistry 010502 geochemistry & geophysics 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Hydrothermal circulation Crystal Crystallography Hydrothermal synthesis General Materials Science Orthorhombic crystal system Nyerereite 0210 nano-technology Boron 0105 earth and related environmental sciences |
| Zdroj: | Crystal Growth & Design. 16:1893-1902 |
| ISSN: | 1528-7505 1528-7483 |
| DOI: | 10.1021/acs.cgd.5b01398 |
| Popis: | Crystals of Na2Ca(CO3)2, the structural analogues of mineral nyerereite, were synthesized using hydrothermal technique at 1 kbar and 450 °C. The crystals are transformational twins formed at the transition from the high-temperature hexagonal modification to the low-temperature orthorhombic modification. The structure was solved and refined to R = 0.059 in P21ca (No. 29) space group with a = 10.0713(5) A, b = 8.7220(2) A, and c = 12.2460(4) A. The only structural analogue of the synthesized crystal is the high-temperature modification of K2Ca(CO3)2, which can be considered as a disordered analogue of Na2Ca(CO3)2. Structural analogues among borates and other classes of compounds have not been found. Based on group–subgroup analysis, we propose the structures of high- and intermediate-temperature modifications of Na2Ca(CO3)2. The relations of the determined structure with other polymorphs of Na2Ca(CO3)2 have also been considered. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|