The oxycarbonate Ba{sub 3}Co{sub 2}O{sub 6}(CO{sub 3}){sub 0.60} with a 2H-ABO{sub 3}-related structure
The crystal structure of Ba{sub 3}Co{sub 2}O{sub 6}(CO{sub 3}){sub 0.60} has been determined by means of X-ray, neutron and electron diffraction, and high-resolution electron microscopy. This compound has a hexagonal symmetry (space group P{bar 6}) and lattice parameters a = 0.9683(1) and c = 0.95180(8) nm related to the 2H-ABO{sub 3} by means of the expression a = a{sub 2H}(3){sup 1/2} and c = 2c{sub 2H}. It can be described from the ordered intergrowth of two blocks, [Ba{sub 2}Co{sub 2}O{sub 6}]{sup {delta}{minus}} and [Ba(CO{sub 3}){sub 0.60}]{sup {delta}+}, alternating along the a-axis. The first block corresponds to two 2H-like rods and the second one can be related to the BaCO{sub 3} aragonite-type structure. Neutron diffraction data elucidate the relative orientation of carbonate groups along c-axis in the aragonite-like blocks.
- Research Organization:
- Univ. Complutense, Madrid (ES)
- OSTI ID:
- 20075549
- Journal Information:
- Chemistry of Materials, Vol. 12, Issue 4; Other Information: PBD: Apr 2000; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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