In:
CrystEngComm, Royal Society of Chemistry (RSC), Vol. 23, No. 38 ( 2021), p. 6675-6681
Abstract:
A new non-centrosymmetric K 2 Ca 3 (CO 3 ) 4 crystal ( P 2 1 2 1 2 1 , a = 7.3905(2) Å, b = 8.8156(3) Å, c = 16.4817(5) Å) was synthesized in a multi-anvil press at a pressure of 3 GPa and temperature of 975 °C. The compound is homeotypic to A 3 B 2 (BO 3 ) 4 (A = Ca, Sr, Ba; B = REE, Y, Bi) orthoborates with the Pnma symmetry, but is characterized by the non-centrosymmetric arrangement of (CO 3 ) anions within the Pnma -pseudosymmetric cation sublattice. K 2 Ca 3 (CO 3 ) 4 represents a pure carbonate member of the extended M 5 (XO 3 ) 4 (X = B, C, B/C) structural type, which also includes A 3 B 2 (BO 3 ) 4 orthoborates as well as recently synthesized mixed orthoborate–carbonates of Ba and Sr. Crystallochemical considerations suggest that cation-substituted (REE, Cs, Sr, and Ba) derivatives of K 2 Ca 3 (CO 3 ) 4 can probably be synthesized at significantly lower pressures than 3 GPa, which is required to stabilize the compound itself.
Type of Medium:
Online Resource
ISSN:
1466-8033
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
2025075-7
Permalink