Disordered rhombohedral K2Ca2(CO3)3: a supposedly transient state within an ambiguous transformation route on decompression

Autor(en): Ronald Miletich, S. Miloš, P. Lotti, A. Likhacheva, A. Romanenko, S. Rashchenko, A. Shatskiy
Abstrakt: Within the K₂CO₃-CaCO₃ system on P,T variation relevant to the Earth's geotherm [1], trigonal K₂Ca₂(CO₃)₃ is one of the known solid key phases with an apparent stability under the conditions of formation. Early descriptions report on intensive polysynthetic twinning in morphologically trigonal crystals [2], and the structure was later solved according to acentric R3 space-group symmetry, but with a model proposed by Winbo et al. (1997) [3] showing conspicuous ADP's and bond lengths.
Organisation(en): Institut für Mineralogie und Kristallographie
Externe Organisation(en): Università degli Studi di Milano, Siberian Branch of the Russian Academy of Sciences, Russian Academy of Sciences
Journal: Acta Crystallographica. Section A: Foundation and Advances
Band: 2024
Anzahl der Seiten: 1
ISSN: 0108-7673
DOI: https://doi.org/10.1107/s205327332409750x
Publikationsdatum: 08-2024
Peer-reviewed: Ja
ÖFOS 2012: 105113 Kristallographie, 105116 Mineralogie
Link zum Portal: https://ucrisportal.univie.ac.at/de/publications/3bf125ea-c4dd-46f8-a15c-ffbc0a9e1be2

Disordered rhombohedral K<sub>2</sub>Ca<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub>: a supposedly transient state within an ambiguous transformation route on decompression