Hydrothermal Synthesis and Structure Solution of Na2Ca(CO3)2: "synthetic Analogue" of Mineral Nyerereite

Pavel N. Gavryushkin, Victor G. Thomas, Nadezhda B. Bolotina, Vladimir V. Bakakin, Alexander V. Golovin, Yurii V. Seryotkin, Dmitry A. Fursenko, Konstantin D. Litasov

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

23 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаанглийский
Страницы (с-по)1893-1902
Число страниц10
ЖурналCrystal Growth and Design
Том16
Номер выпуска4
DOI
СостояниеОпубликовано - 6 апр 2016

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