| Инд. авторы: | Gavryushkin P.N., Thomas V.G., Bolotina N.B., Bakakin V.V., Golovin A.V., Seryotkin Y.V., Fursenko D.A., Litasov K.D. |
| Заглавие: | Hydrothermal Synthesis and Structure Solution of Na2Ca(CO3)2: 'synthetic Analogue' of Mineral Nyerereite |
| Библ. ссылка: | Gavryushkin P.N., Thomas V.G., Bolotina N.B., Bakakin V.V., Golovin A.V., Seryotkin Y.V., Fursenko D.A., Litasov K.D. Hydrothermal Synthesis and Structure Solution of Na2Ca(CO3)2: 'synthetic Analogue' of Mineral Nyerereite // Crystal Growth & Design. - 2016. - Vol.16. - Iss. 4. - P.1893-1902. - ISSN 1528-7483. - EISSN 1528-7505. |
| Внешние системы: | DOI: 10.1021/acs.cgd.5b01398; SCOPUS: 2-s2.0-84964601638; WoS: 000373747700015; |
| Реферат: | eng: 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) Å, b = 8.7220(2) Å, and c = 12.2460(4) Å. 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. © 2016 American Chemical Society.
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| Издано: | 2016 |
| Физ. характеристика: | с.1893-1902 |