منابع مشابه
CHARGE DISPROPORTIONATION IN Fe4+-OXIDES WITH PEROVSKITE-TYPE STRUCTURES
For a further examination and elaboration of our simple charge disproportionation model for Fe4+-oxides, 2~e" + Fe3+ + Fe5+, two series of solid solutions Cal-xSrxFe03 and Srl-xLaxFe03 with the perovskite structure have been studied. The Msssbauer spectrum of Sro.sLao.sFeO3 at 4 K clearly indicates the disproportionation. For both series of oxides, the disproportionation seems to set in at the ...
متن کاملIs ReO3 a mixed ionic-electronic conductor? A DFT study of defect formation and migration in a BVIO3 perovskite-type oxide.
Density-functional-theory (DFT) calculations within the generalised gradient approximation (GGA) were used to examine the behaviour of point defects in the cubic BVIO3 perovskite-type oxide, ReO3. Energies of reduction and of hydration were calculated, and the results are compared with literature data for ABO3 perovskite oxides. The activation energies of migration were determined for O2-, H+, ...
متن کاملSynthesis and characterization of NaNiF3·3H2O: an unusual ordered variant of the ReO3 type.
A new hydrated sodium nickel fluoride with nominal composition NaNiF3·3H2O was synthesized using an aqueous solution route. Its structure was solved by means of ab initio methods from powder X-ray diffraction and neutron diffraction data. NaNiF3·3H2O crystallizes in the cubic crystal system, space group Pn3̅ with a = 7.91968(4) Å. The framework, derived from the ReO3 structure type, is built fro...
متن کاملElectrochemical fluorination of perovskite type BaFeO2.5.
Here we report on the first electrochemical fluorination exemplarily performed on perovskite type BaFeO2.5. A cell setup of the type BaFeO2.5 II La0.9Ba0.1F2.9 II MFx (with MFx being MgF2 and CeF3) was used to perform the reaction, charging the cell up to voltages of about 4 V. Formation of a compound of approximate composition BaFeO2.5F∼0.5 was observed, in agreement with diffraction studies o...
متن کاملAuto - combustion synthesis of perovskite - type oxides
A versatile one-pot auto-combustion method for the synthesis of powders of iron-doped strontium titanate, SrTi1-xFexO3-δ, has been developed. The synthesis is optimised by the combined use of EDTA and citric acid as chelating agents, and an appropriate balance between fuel and oxidising elements in the reaction mixture. The method produces immediately an almost phase-pure perovskite oxide powde...
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ژورنال
عنوان ژورنال: Nature Reviews Materials
سال: 2020
ISSN: 2058-8437
DOI: 10.1038/s41578-019-0160-x