Transformation of Dion-Jacobson-type layered oxyfluorides into new anion-deficient pyrochlore-type oxides, ASrNb(2)O(6.5) (A = Li and Na)

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New pyrochlore-type oxides, ASrNb(2)O(6.5) (A = Li and Na), were prepared from Dion-Jacobson-type layered perovskite oxyfluorides, ASrNb(2)O(6)F. The prototype layered perovskite phases are transformed into anion-deficient pyrochlore-type oxides by heating above 600 degreesC in air. The ASrNb(2)O(6)F (A = Rb and K) and RbCaNb2O6F compounds have the layered perovskite structure, whereas the pyrochlore structure is found to be more stable than the layered perovskite in the AF-SrNb2O6 (A = Li and Na) and KF-CaNb2O6 systems.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2002
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS CHEMISTRY, v.12, no.4, pp.1001 - 1004

ISSN
0959-9428
DOI
10.1039/b107254b
URI
http://hdl.handle.net/10203/255927
Appears in Collection
NT-Journal Papers(저널논문)
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