Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Oxidation resistance of Ln-Si-O-N powders (Ln = Y, Gd and La)
Autore:
van Krevel, JWH; Hintzen, HT; Metselaar, R; Le Gendre, L; Marchand, R;
Indirizzi:
Univ Rennes 1, Lab Verres & Ceram, UMR 6512 CNRS, F-35042 Rennes, France Univ Rennes 1 Rennes France F-35042 MR 6512 CNRS, F-35042 Rennes, France Eindhoven Univ Technol, Lab Solid State & Mat Chem, NL-5600 MB Eindhoven, Netherlands Eindhoven Univ Technol Eindhoven Netherlands NL-5600 MB ven, Netherlands
Titolo Testata:
SOLID STATE SCIENCES
fascicolo: 1-2, volume: 3, anno: 2001,
pagine: 49 - 56
SICI:
1293-2558(200101/02)3:1-2<49:OROLP(>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRYSTAL-STRUCTURES; NITROGEN; MELILITE; PHASE; SILICATES; SYSTEM; ND2SI2.5AL0.5O3.5N3.5; Y2SI3O3N4; CERAMICS; OXYGEN;
Keywords:
oxynitrides; Ln-Si-O-N; oxidation; TGA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Marchand, R Univ Rennes 1, Lab Verres & Ceram, UMR 6512 CNRS, Campus Beaulieu, F-35042Rennes, France Univ Rennes 1 Campus Beaulieu Rennes France F-35042 s, France
Citazione:
J.W.H. van Krevel et al., "Oxidation resistance of Ln-Si-O-N powders (Ln = Y, Gd and La)", SOLID ST SC, 3(1-2), 2001, pp. 49-56

Abstract

For application of Ln-Si-O-N (Ln = Y, Gd and La) oxynitride materials, e.g. as host-lattices for lamp phosphors, oxidation resistance up to about 600degreesC in air is a prerequisite. In this study we prepared Ln-Si-O-N (Ln= Y, Gd and La) powders by solid state reaction and observed via TGA/DTA-experiments that most compounds are oxidation resistant up to 600 degreesC in air. The stability in air at high temperatures increases going from Ln(5)(SiO4)(3)N, Ln(4)Si(2)O(7)N(2), LnSiO(2)N, Ln(2)Si(3)O(3)N(4) to Ln(3)Si(8)O(4)N(11). This is explained by an increasing cross-linking between the silicon-oxygen-nitrogen tetrahedra in this sequence. For the lattices with less cross-linking between the silicon-oxygen-nitrogen tetrahedra we observed that the oxidation resistance decreases slightly going from Y and Gd to La. For these lattices, also, an additional weight gain was observed during the oxidation reaction, which was higher than expected for complete oxidation. The additional weight gain was ascribed to an intermediate phase in whichnitrogen retention takes place. (C) 2001 Editions scientifiques et medicales Elsevier SAS. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/17 alle ore 17:28:03