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Titolo:
EFFECT OF MN VALENCE ON CRYSTAL-STRUCTURE OF LA-MN-O PEROVSKITE OXIDES
Autore:
YAO T; ITO T; KOKUBO T;
Indirizzi:
KYOTO UNIV,GRAD SCH ENGN,SAKYO KU KYOTO 606 JAPAN
Titolo Testata:
Journal of materials research
fascicolo: 5, volume: 10, anno: 1995,
pagine: 1079 - 1082
SICI:
0884-2914(1995)10:5<1079:EOMVOC>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
OXIDATION-REDUCTION BEHAVIOR; SR-DOPED LAMNO3; DEFECT STRUCTURE; PHASE; STABILITY;
Tipo documento:
Note
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
13
Recensione:
Indirizzi per estratti:
Citazione:
T. Yao et al., "EFFECT OF MN VALENCE ON CRYSTAL-STRUCTURE OF LA-MN-O PEROVSKITE OXIDES", Journal of materials research, 10(5), 1995, pp. 1079-1082

Abstract

La:Mn = 1:1 mixtures of lanthanum oxide and manganese carbonate were heat-treated under various oxygen partial pressures at 1400 degrees C or 1300 degrees C. The Mn valence of the samples was measured by a chemical analysis, and the crystal structures were refined by the powder x-ray diffraction and the Rietveld analysis. A novel orthorhombic perovskite phase, belonging to the space group Pbnm and containing Mn2+ ions, was formed by heat-treatment under low oxygen partial pressures. The structure was very close to a cubic symmetry. It is supposed that the micro Jahn-Teller effects of Mn2+ ions were nearly canceled by one another.

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Documento generato il 24/09/20 alle ore 10:50:35