ISSN:
1572-8854
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract The crystal structures of CsCrO3Cl and RbCrO3Cl have been determined from MoKα1diffractometer data and refined anisotropically toR = 0.029 andR = 0.033 respectively for 769 and 590 statistically significant reflections. CsCrO3Cl, which has a structure of the BaSO4 type, crystallizes in the orthorhombic space groupPnma, witha = 9.928,b = 6.043,c = 8.712 Å andZ = 4. RbCrO3Cl is isostructural with KCrO3C1 and NH4CrO3Cl and crystallizes in the monoclinic space groupP21/c witha = 7.857,b = 7.711,c = 8.055 Å, β = 90.43 ° andZ = 4. The geometry of the approximately tetrahedral CrO3Cl− groups is very similar in both structures, and the Cr-Cl and average Cr-O bond distances, corrected for thermal vibration of the terminal atoms, are 2.197 and 1.612 Å in CsCrO3Cl and 2.194 and 1.606 Å in RbCrO3Cl. Caesium ions are in 12-fold coordination and rubidium ions in irregular 11-fold coordination to chlorine and oxygen.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01197910
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