Pb[sub 1-x]Sr[sub 4]Fe[sub 2]O[sub 9-[delta]]: A layered iron oxide intergrowth of 1201- and 0201-type structures
- CNRS ISMRa, Caen (France)
A new layered iron oxide, Pb[sub 1-x]Sr[sub 4]Fe[sub 2]O[sub 9-[delta]], has been isolated for 0[le] x [le]0.2. Its structural model, which corresponds to a regular intergrowth of single [SrFeO[sub 3-[delta]]][sub x] perovskite layers with single [SrO][sub x] and double [(SrO)(Pb[sub 1-x ]O)][sub x] rock salt layers, has been established by high resolution electron microscopy (HREM) and powder XRD. The existence of numerous defects-local variation of the nature of the cations, modulations of the atomic layers, and intergrowth defects interpreted as [Sr[sub 3]Fe[sub 2]O[sub 7-[delta]]][sub x], and [Sr[sub 4]Fe[sub 3]O[sub 10-[delta]]] layers-has been observed by HREM. The existence for FE(III) of two 5 + 1 coordinations for x = 0, and of three coordinations for x [ne] 0 (two 5 + 1 and one pure pyramidal coordination) has been deduced from Mossbauer spectroscopy measurements.
- OSTI ID:
- 6926272
- Journal Information:
- Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 102:1; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
ELECTRON MICROSCOPY
IRON COMPOUNDS
IRON OXIDES
LEAD COMPOUNDS
LEAD OXIDES
MICROSCOPY
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
SCATTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION