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Possible Existence of Alkali Metal Orthocarbonates at High Pressure
Author(s) -
Čančarević Željko P.,
Schön J. Christian,
Jansen Martin
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200601637
Subject(s) - alkali metal , oxide , high pressure , metal , carbonate , alkaline earth metal , inorganic chemistry , materials science , chemistry , thermodynamics , metallurgy , physics , organic chemistry
We investigate the possible existence of crystalline alkali metal orthocarbonates, A 4 CO 4 , where A=Li, Na, K, Rb, and Cs. We study the equilibrium between the possible modifications of the orthocarbonate A 4 CO 4 and the binary mixture of the possible modifications of the alkali oxide A 2 O and those of the alkali metal carbonate A 2 CO 3 as function of pressure. In all cases, the orthocarbonate should be stable at sufficiently high pressure ranging from 22–32 GPa (Rb 4 CO 4 ) to 200–220 GPa (Cs 4 CO 4 ).
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