On the relations between ISE and structure in some RE(Mg)SiAlO(N) glasses
Six oxide and oxynitride glasses were synthesized in the Y–Mg–Si–Al–O–N, Nd–Mg–Si–Al–O–N and La–Mg–Si–Al–O–N systems. As already known, nitrogen introduction increases the T g , packing factor and mechanical properties of the glasses. Cationic substitution also has an influence on the glasses’ behav...
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Veröffentlicht in: | Journal of materials science 2008-11, Vol.43 (22), p.7239-7246 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Six oxide and oxynitride glasses were synthesized in the Y–Mg–Si–Al–O–N, Nd–Mg–Si–Al–O–N and La–Mg–Si–Al–O–N systems. As already known, nitrogen introduction increases the
T
g
, packing factor and mechanical properties of the glasses. Cationic substitution also has an influence on the glasses’ behavior, particularly in terms of sensitivity to indentation load/size effect (ISE). The structure of the yttrium-containing glasses was investigated by mean of
27
Al and
29
Si MAS-NMR. Al is found to occur for 2/3 as a network former and for 1/3 as a modifier. The oxide glass mainly contains Q
2
and Q
3
silicate units and SiO
3
N and SiO
2
N
2
units are created when nitrogen is introduced into the glass network. The average number of rigid bonds per network former
was calculated from the glasses’ composition. A discrepancy between
and the Raman spectra of the glasses suggests that parts of the magnesium behaves as a former in the network.
seems to be a key parameter governing hardness and sensitivity to ISE and can be linked to normal/abnormal behavior of glasses regarding indentation. |
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ISSN: | 0022-2461 1573-4803 |
DOI: | 10.1007/s10853-008-2851-3 |