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Titolo:
Crystal structure of the mixed oxides La0.7Sr0.3Co1-zMnzO3 +/- y (0 <= z <= 1)
Autore:
Petrov, AN; Voronin, VI; Norby, T; Kofstad, P;
Indirizzi:
Ural State Univ, Dept Chem, Ekaterinburg 620083, Russia Ural State Univ Ekaterinburg Russia 620083 , Ekaterinburg 620083, Russia RAS, Inst Met Phys, Ural Branch, Ekaterinburg 62021, Russia RAS Ekaterinburg Russia 62021 s, Ural Branch, Ekaterinburg 62021, Russia Univ Oslo, Ctr Mat Sci, N-0371 Oslo, Norway Univ Oslo Oslo Norway N-0371Univ Oslo, Ctr Mat Sci, N-0371 Oslo, Norway
Titolo Testata:
JOURNAL OF SOLID STATE CHEMISTRY
fascicolo: 1, volume: 143, anno: 1999,
pagine: 52 - 57
SICI:
0022-4596(19990215)143:1<52:CSOTMO>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
OXIDATION-REDUCTION BEHAVIOR; SR-DOPED LAMNO3; DEFECT CHEMISTRY; MAGNETIC-PROPERTIES; NONSTOICHIOMETRY; LAMNO3+/-DELTA; STATE;
Keywords:
perovskite; mixed oxides; structure; nonstoichiometry; lanthanum manganite; lanthanum cobaltate; powder; X-ray diffraction (PXD); powder neutron diffraction (PND);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Petrov, AN Ural State Univ, Dept Chem, Lenin Ave 51, Ekaterinburg 620083, Russia Ural State Univ Lenin Ave 51 Ekaterinburg Russia 620083 Russia
Citazione:
A.N. Petrov et al., "Crystal structure of the mixed oxides La0.7Sr0.3Co1-zMnzO3 +/- y (0 <= z <= 1)", J SOL ST CH, 143(1), 1999, pp. 52-57

Abstract

The crystal structure and nonstoichiometry of several compositions in the system La0.7Sr0.3Co1-zMnzO3+/-y (0 less than or equal to z less than or equal to 1) have been investigated by powder X-ray diffraction (PXD), powder neutron diffraction (PND), thermogravimetry (TG), including full reduction in hydrogen, and chromatometric titration. The system formed solid solutionsover the entire compositional range (0 less than or equal to z less than or equal to 1) crystallizing in the rhombohedral structure (space group R (3) over bar c). The lattice constant increased with increasing Mn content z. The cation stoichiometry (occupancy) was calculated from refinement of PXDdata, and oxygen positions and occupancies were calculated from PND data. These results confer with the TG and chemical analysis of oxygen content inthat the Go-rich compositions exhibit oxygen deficiency (oxygen vacancies), while the Mn-rich compositions exhibit oxygen excess in the form of metalvacancies. (C) 1999 Academic Press.

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Documento generato il 24/09/20 alle ore 11:30:23