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Titolo:
NEUTRON-DIFFRACTION STUDY ON THE STRUCTURE OF NA-SI-O-N OXYNITRIDE GLASSES
Autore:
JIN JS; YOKO T; MIYAJI F; SAKKA S; FUKUNAGA T; MISAWA M;
Indirizzi:
KYOTO UNIV,INST CHEM RES UJI KYOTO 611 JAPAN
Titolo Testata:
Journal of the American Ceramic Society
fascicolo: 3, volume: 76, anno: 1993,
pagine: 630 - 634
SICI:
0002-7820(1993)76:3<630:NSOTSO>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
TOTAL SCATTERING; MAS NMR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
J.S. Jin et al., "NEUTRON-DIFFRACTION STUDY ON THE STRUCTURE OF NA-SI-O-N OXYNITRIDE GLASSES", Journal of the American Ceramic Society, 76(3), 1993, pp. 630-634

Abstract

The local structure of a Na2O-SiO2 oxide glass and a Na2O-SiO2-Si3N4 oxynitride glass has been investigated by the pulsed neutron diffraction method. In the oxide glass, the first peak of radial distribution function (RDF) curves appeared at 0.1627 nm corresponding to Si-O bond length. In the oxynitride glass, the first peak of the RDF curve was shifted to longer distances at 0.1650 nm due to the coexistence of Si-Oand Si-N bonds. The first peak in the RDF curve of the oxynitride glass was deconvoluted into two peaks whose positions are located at 0.1626 and 0.1709 nm. The one at 0.1626 nm is ascribed to Si-O bonds and the other at 0.1709 nm to Si-N bonds. The number of silicon atoms around a nitrogen was found to be 2.42, suggesting that not all of the nitrogen atoms are bonded to three silicon atoms, but 58% twofold (-N-) and 42% threefold (>N-) nitrogens coexist in the present Na-Si-O-N oxynitride glass. The formation of twofold nitrogens may arise from the reaction between =Si-O- and =Si3N groups. This model is compatible with the experimental observation that the density and Vickers hardness of oxynitride glasses increase with the nitrogen content.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 02:58:50