Structural characterization of TiO2-P2O5-CaO glasses by spectroscopy
authors Silva, AMB; Correia, RN; Oliveira, JMM; Fernandes, MHV
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords Glass; TiO2; Spectroscopy; Structure; Biomedical applications
keywords SODIUM TITANOPHOSPHATE GLASSES; PHOSPHATE-GLASSES; RAMAN-SPECTROSCOPY; ULTRAPHOSPHATE GLASSES; MECHANICAL-PROPERTIES; CERAMICS; CRYSTALLIZATION; SYSTEM; TIO2; BETA-CA2P2O7
abstract The structure of glasses with composition x TiO2 center dot(65 - x) P2O5 center dot 35 CaO (x = 0-30 mol%) has been studied and their glass transition temperature, Raman and NMR spectra have been analysed. For TiO2-free glass two phosphate species have been identified as Q(2) and Q(3). Increasing TiO2 content in glass compositions results in the disappearance of the Q3 and Q2 species and in the formation of, mainly, pyrophosphate structure, Q(1). In calcium titanophosphate glass with higher TiO2 content the structure consists of a distorted Ti octahedral linked to pyrophosphate unit through P-O-Ti bonds. In these glass series the structural cohesion increases with TiO2, although a depolymerization in the original P-O-P network occurs. The study of these glasses and the understanding of their structural characteristics can give a valuable contribution for the clarification of their degradation behaviour namely in biological environments. (C) 2009 Elsevier Ltd. All fights reserved.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2010
volume 30
issue 6
beginning page 1253
ending page 1258
digital object identifier (doi) 10.1016/j.jeurceramsoc.2009.11.001
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000275635000006
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