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Titolo:
PREPARATION AND STRUCTURAL CHARACTERIZATION OF PEROVSKITE-TYPE LA(X)LN''1-XCOO3 BY THE THERMAL-DECOMPOSITION OF HETERONUCLEAR COMPLEXES, LA(X)LN''(1-X) [CO(CN)(6)]CENTER-DOT-NH(2)O (LN''=SM AND HO)
Autore:
SADAOKA Y; TRAVERSA E; SAKAMOTO M;
Indirizzi:
EHIME UNIV,FAC ENGN,DEPT APPL CHEM MATSUYAMA EHIME 790 JAPAN UNIV ROMA TOR VERGATA,DEPT CHEM SCI & TECHNOL I-00133 ROME ITALY YAMAGATA UNIV,FAC SCI,DEPT MAT & BIOL CHEM YAMAGATA 990 JAPAN
Titolo Testata:
Journal of alloys and compounds
fascicolo: 1-2, volume: 240, anno: 1996,
pagine: 51 - 59
SICI:
0925-8388(1996)240:1-2<51:PASCOP>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
LAFEO3; OXIDES;
Keywords:
PEROVSKITE-TYPE OXIDES; LANTHANUM COBALT OXIDES; HETERONUCLEAR COMPLEXES; HEXACYANO COMPLEXES;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
13
Recensione:
Indirizzi per estratti:
Citazione:
Y. Sadaoka et al., "PREPARATION AND STRUCTURAL CHARACTERIZATION OF PEROVSKITE-TYPE LA(X)LN''1-XCOO3 BY THE THERMAL-DECOMPOSITION OF HETERONUCLEAR COMPLEXES, LA(X)LN''(1-X) [CO(CN)(6)]CENTER-DOT-NH(2)O (LN''=SM AND HO)", Journal of alloys and compounds, 240(1-2), 1996, pp. 51-59

Abstract

Perovskite-type La(x)Ln''1-xCoO3 oxides are prepared by the thermal decomposition of La(x)Ln''(1-x) [Co(CN)(6)] . nH(2)O heteronuclear complexes. Except for LaCoO3 (hexagonal), the structures observed for LaxSm1-xCoO3 are orthorhombic. While the perovskite-type oxide HoCoO3 is not formed by decomposition at 1000 degrees C of the corresponding hexacyano complex, the partial replacing of Ho with La is effective in forming the perovskite-type oxide having an orthorhombic structure containing Ho even at 800 degrees C. A monotonous correlation (quasi-linear relationship) was found between the b- and c-lattice constants of the orthorhombic structures of the perovskite-type oxides and the effective radii of Ln ions, defined as r(eff) = xr(La) +(1-x)r(Ln''). The distortion parameter for the orthorhombic cell (3(0.5)a/b-1) increases with decrease in r(eff) and is expected to be 0.270 for perovskite-type HoCoO3. The crystal structure of the La(x)L(1-x)CoO(3) oxides is mainlycontrolled by the effective radii of Ln ions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 14:17:34