Hydrothermal Synthesis and Structure Solution of Na2Ca(CO3)2: “Synthetic Analogue”
of Mineral Nyerereite
Version 2 2016-03-31, 13:55
Version 1 2016-02-23, 15:55
Posted on 2016-02-03 - 00:00
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.
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Gavryushkin, Pavel N.; Thomas, Victor G.; Bolotina, Nadezhda B.; Bakakin, Vladimir V.; Golovin, Alexander V.; Seryotkin, Yurii
V.; et al. (2016). Hydrothermal Synthesis and Structure Solution of Na2Ca(CO3)2: “Synthetic Analogue”
of Mineral Nyerereite. ACS Publications. Collection. https://doi.org/10.1021/acs.cgd.5b01398
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AUTHORS (8)
- PGPavel N. GavryushkinVTVictor G. ThomasNBNadezhda B. BolotinaVBVladimir V. BakakinAGAlexander V. GolovinYSYurii V. SeryotkinDFDmitry A. FursenkoKLKonstantin D. Litasov
