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Titolo:
Synthesis and structural characterization of trimetallic perovskite-type rare-earth orthoferrites, LaxSm1-xFeO3
Autore:
Traversa, E; Nunziante, P; Sangaletti, L; Allieri, B; Depero, LE; Aono, H; Sadaoka, Y;
Indirizzi:
Consorzio Interuniv Nazl Sci & Tecnol Mat, INSTM, I-00133 Rome, Italy Consorzio Interuniv Nazl Sci & Tecnol Mat Rome Italy I-00133 Rome, Italy Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, ItalyUniv Roma Tor Vergata Rome Italy I-00133 ecnol Chim, I-00133 Rome, Italy Ist Nazl Fis Mat, I-25121 Brescia, Italy Ist Nazl Fis Mat Brescia Italy I-25121 l Fis Mat, I-25121 Brescia, Italy Univ Cattolica Sacro Cuore, Dipartimento Matemat & Fis, I-25121 Brescia, Italy Univ Cattolica Sacro Cuore Brescia Italy I-25121 I-25121 Brescia, Italy Univ Brescia, Dipartimento Ingn Meccan, I-25123 Brescia, Italy Univ Brescia Brescia Italy I-25123 o Ingn Meccan, I-25123 Brescia, Italy Ehime Univ, Fac Engn, Dept Mat Sci & Engn, Matsuyama, Ehime 7908577, JapanEhime Univ Matsuyama Ehime Japan 7908577 Matsuyama, Ehime 7908577, Japan
Titolo Testata:
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
fascicolo: 5, volume: 83, anno: 2000,
pagine: 1087 - 1092
SICI:
0002-7820(200005)83:5<1087:SASCOT>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
NANOSIZED LAFEO3 POWDERS; THERMAL-DECOMPOSITION; HETERONUCLEAR COMPLEX; ELECTROCERAMIC APPLICATIONS; RAMAN-SCATTERING; OXYGEN SENSORS; GAS SENSORS; THICK-FILMS; OXIDES; ELECTRODES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
58
Recensione:
Indirizzi per estratti:
Indirizzo: Traversa, E Consorzio Interuniv Nazl Sci & Tecnol Mat, INSTM, I-00133 Rome, Italy Consorzio Interuniv Nazl Sci & Tecnol Mat Rome Italy I-00133
Citazione:
E. Traversa et al., "Synthesis and structural characterization of trimetallic perovskite-type rare-earth orthoferrites, LaxSm1-xFeO3", J AM CERAM, 83(5), 2000, pp. 1087-1092

Abstract

Ultrafine powders of trimetallic orthoferrites containing lanthanum and samarium in various ratios were synthesized by thermal decomposition at low temperatures of the corresponding hexacyano complexes to modulate the functional properties of these perovskite-type oxides. The precursors and their decomposition products were analyzed by simultaneous thermogravimetric and differential thermal analyses, X-ray diffractometry, and Raman spectroscopy. Single-phase trimetallic precursors and oxides were obtained. The crystal structure of the perovskite-type oxides was orthorhombic, and the lattice parameters were affected by the ionic size of the rare-earth elements present in the oxides. Raman spectra showed a broadening of the vibrational bandswith increased lanthanum content, This was ascribed to some disorder in the oxygen sublattice, related to distortions of the cation-oxygen coordination, and to a reduction of the orthorhombic distortion in the unit-cell basal plane. Most of the Raman modes above 200 cm(-1), associated with the vibration of oxygen ions, showed a frequency increase with effective cation mass, defined as m(eff) = xm(La) + (1 - x)m(Sm), i.e., with samarium content, This was explained by assuming that the force constants increased with decreased Ln-O and Fe-O interatomic distances observed for high samarium content.

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Documento generato il 04/04/20 alle ore 14:57:01