Mechanical properties of silicon-oxynitride glasses

La–Si–O–N glasses

“…A recent investigation by us of a series of these glasses by solid state NMR 47 indicates accordingly, that for glasses with high X:M ratios, the O and N atoms play similar structural roles, i.e. a predominant fraction of the nitrogen atoms are present as N [1] and N [2] . It may be noted that anomalously high X:M ratios could be a result of the glasses containing significant amounts of isolated X [0] species, i.e.…”

“…Cross-linking of SiX 4 tetrahedra X [1] X [2] X [3] La 5 Concurrently there is an increase in the average connectivity of N and a decrease in the X:M ratios. However, the compositional trends clearly differ between these crystalline compounds and the glasses, which make further comparisons difficult.…”

“…The importance of an oxynitride liquid phase during sintering and densification of Si 3 N 4 based ceramics is well known. This has led to studies on the preparation and property characterization of bulk oxynitride glasses in the systems M-Si-(Al)-O-N (M = Na, [1][2][3][4][5] Li, 3,6,14 Sc,7,15 Ba, 3,8 Mn, 3,9,10 Y, 11,16,17,18 La, 12,17,18 Mg, 8,[13][14][15][16] Ca, 5,9,10,14 Nd, 9,17,18,20,22 Ce, 18,20,21 Sm, 17,20,22 Gd, 17,19,22 Eu, 20 Dy, 17,18,20,22 Ho, <...>…”

Compositional effects on the properties of high nitrogen content alkaline-earth silicon oxynitride glasses, AE=Mg, Ca, Sr, Ba

“…Since then, oxynitride glasses have received considerable attention, from both scientific and technological points of view, as it was realized that incorporation of nitrogen into silicate glasses causes profound alterations of mechanical properties such as strength, toughness, elastic modulus, and hardness. [4][5][6][7][8][9][10][11][12] It was also found that the thermal properties are also affected, with oxynitride glasses having higher glass transition temperatures (T g ) and lower thermal expansion coefficients (α). 13 Oxynitride glasses show furthermore the highest refractive indexes ever obtained for silicate based glasses.…”

La-Si-O-N glasses

“…16 Considerably fewer studies have been done on M-Si-O-N systems that contain only Si and one modifier. 17,18 The observed increase in hardness with increasing N content has commonly, but not without exceptions, been attributed to the existence of substantial amounts of N [3] , i.e. N atoms that bind to three Si atoms, which allegedly increases the cross-linking in the framework and stiffens the glass.…”