| Autor: |
Graeme R. Blake, J. Darriet, Peter D. Battle, Jonathan G. Gore, François Weill |
| Přispěvatelé: |
Zernike Institute for Advanced Materials |
| Jazyk: |
angličtina |
| Rok vydání: |
1997 |
| Předmět: |
|
| Zdroj: |
Journal of Materials Chemistry, 7(8), 1559-1564. ROYAL SOC CHEMISTRY |
| Popis: |
The new phase Ba 6 CuIr 4 O 15 has been shown by powder X-ray diffraction to be a member of the perovskite-related structural family A 3n+3 A′ n B n+3 O 6n+9 withn=1; space group R32, a=10.1196(3), c=13.4097(4) A. The trigonal-prismatic A′ sites and the octahedral B sites are both occupied by a disordered distribution of Ir and Cu. A combination of electron microscopy and X-ray diffraction has shown that Ba 6 ZnIr 4 O 15 has a related incommensurate structure with a≈10.1, c≈4.4 A and a modulation vector q = a *+0.35 c *. Alternatively, Ba 6 ZnIr 4 O 15 can be considered as a composite of trigonal (cell 1) and rhombohedral (cell 2) substructures with a 1 =a 2 =10.1228(9) c 1 =4.4099(6), c 2 =2.6982(2) A. It is shown that the same structural formalism can be used to describe the incommensurate hexagonal phase of SrMn 1-x Co x O 3-y . |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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