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Structure and rheological properties of the RE-Si-Mg-O-N (RE = Sc, Y, La, Nd, Sm, Gd, Yb and Lu) glasses

Lofaj, F.; Deriano, S.; LeFloch, M.; Rouxel, T.; Hoffmann, M. J.

Abstract:
Structure, viscosity, glass transition temperature, Littleton
temperature and elastic moduli were investigated by MAS-NMR
spectroscopy, compressive creep, dilatometry and ultrasound velocity
experiments, in order to reveal the effects of rare earth elements and
nitrogen on the behavior of RE-Si-Mg-O-N glasses (RE = Sc, Y, La, Nd,
Sm, Gd, Yb and L) with different nitrogen contents. NMR showed that
nitrogen modifies the glass structure depending on RE type via
increasing content of SiO3N(+Q(1)) units at the expense of Q(2) units
and Lu seems to be more effective in their formation than La. Despite
that, the effects of rare-earth modifiers and nitrogen as network
former are independent, additive and a synergy effect was not observed.
Approximately linear dependencies of most properties on molar volume
(and ionic radii) suggest that glass network is tightened
proportionally to ionic radius of corresponding modifier and
cross-linking is proportional to nitrogen content. However, the
mechanism involved in lanthanide effect is different from that of Sc
and Y additives, although they result in properties similar to those of
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Zugehörige Institution(en) am KIT Institut für Keramik im Maschinenbau (IKM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2004
Sprache Englisch
Identifikator ISSN: 1385-3031
KITopen-ID: 1000007644
Erschienen in Journal of Non-Crystalline Solids
Band 344
Heft 1-2
Seiten 8-16
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