Structural characterisation of Er-Si-Al-O-N glasses by Raman spectroscopy

Dolekcekic E., Pomeroy M. J., Hampshire S.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, vol.27, no.2-3, pp.893-898, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 27 Issue: 2-3
  • Publication Date: 2007
  • Doi Number: 10.1016/j.jeurceramsoc.2006.04.058
  • Journal Name: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.893-898
  • Keywords: Raman spectroscopy, OXYNITRIDE GLASSES, NEUTRON-DIFFRACTION, SIALON GLASSES, MAS-NMR, CRYSTALLIZATION, CERAMICS, LU, GD, RE, LA
  • Anadolu University Affiliated: Yes

Abstract

Er-Si-Al-O-N glasses have been prepared with cation ratio Er:Si:AI=3.45:3:2 containing various amounts of nitrogen (N=O, 5, 8, 15 and 22equiv.%). Glass properties such as microhardness, glass transition temperature and dilatometric softening temperature were measured and it was found that these properties increased linearly with increasing nitrogen content. Glasses were then characterised using Raman spectroscopy in order to obtain information about the structure of these glasses. Deconvolution of peaks in the Raman spectra of Er-Si-Al-O-N glasses revealed that, as nitrogen content increases then the proportion of Q(3) species decreases and there is a corresponding increase in the proportion of Q(4) species (Q(n): n = no. of bridging anions joining SiO4 tetrahedra), confirming that nitrogen increases the crosslinking between individual tetrahedra via the transformation of Q(3) oxide species into Q(4) oxynitride species. (c) 2006 Elsevier Ltd. All rights reserved.