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The Syntheses and Structures of the Complex Oxide Carbonates Ba11Pd11O20(CO3)2and Ba88Ni87O156(CO3)19)

✍ Scribed by R.J. Crooks; M.T. Weller


Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
660 KB
Volume
128
Category
Article
ISSN
0022-4596

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✦ Synopsis


A new palladate analog, Ba 11 Pd 11 O 20 (CO 3 ) 2 , of the complex copper oxide carbonate, Ba 44 Cu 48 (CO 3 ) 6 O 87.9 , has been synthesized by reaction of PdO and BaCO 3 at 810Β°C. The structure of this phase and the isostructural nickelate have been refined from high resolution powder neutron diffraction data. The structure consists of cages M 18 O 24 and M 6 O 12 rings (M ‫؍‬ Pd, Ni) separated by barium ions and carbonate groups. A section of the structure separating two M 18 O 24 units is strongly disordered and has been refined as containing either carbonate groups or isolated MO 4 square planes. The presence and symmetry of the carbonate groups in these structures has been investigated by infrared and Raman spectroscopy.


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