The crystal structure of Ba 3 CuRu 2 O 9 , determined by powder neutron di4raction, is reported for temperatures of 18+295 K. Structural re5nements by powder neutron di4raction for the previously reported compounds Ba 3 M Ru 2 O 9 for M β«Ψβ¬ Fe, Co, Ni, and In are also reported. All structures consis
The Syntheses and Structures of the Complex Oxide Carbonates Ba11Pd11O20(CO3)2and Ba88Ni87O156(CO3)19)
β 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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β¦ 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 β«Ψβ¬ 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.
π SIMILAR VOLUMES
The nickel complex 2 Ni shows reactivity about 10 3 times greater than that of the cobalt analogue 2 Co . The oxidation ability of the M III (m-O) 2 M III core should be affected by the hindered Tp R ligand system, which can stabilize the 2 oxidation state of the metal centers.