Silicon Metal Oxynitride Glasses

Nitride Ceramics

“…Both Shillito et al (1978) and Loehman (1979Loehman ( ,1980 were among the first to report correlations between amounts of nitrogen incorporated into oxynitride glasses and changes in their physical properties. Shillito et al reported a linear increase in the Knoop hardness of a Y-Si-Al-O-N glass as the nitrogen content increased.…”

Thermal expansion and glass transition temperature of the rare-earth doped oxynitride glasses

“…2À7,11,12 Because of higher valence of nitrogen, partial substitution of oxygen by nitrogen in the network produces tighter and more linked structure. It results in linear increase in density, 4,10,13À17 hardness, 3,4,8,9,15,17 Young's modulus, 8,13,16À18 thermal expansion coefficient, 4,6,9,13,19,20 glass transition temperature, 4,6,9,13,19,20 viscosity 9,14,15,21 etc. For instance, adding 20 eq.% of N resulted in 33% increase in La-and 23% increase of elastic modulus in Lu-containing oxynitride glasses.…”

Hardness and refractive index of Ca–Si–O–N glasses

“…Oxynitride glass systems that have been investigated with regard to refractive index are Y-Al-Si-O-N [10][11][12], M-Si-Al-O-N [10][11][12]15,17,[20][21][22] with M = Mg, Ca, Y, and Nd, RE-Al-Si-O-N [32] and Gd-Al-Si-O-N [33]. The refractive index is found to increase with both increasing nitrogen content and change with the content of the glass modifier, the latter in a way and to an extent that depends on the atomic number of the modifier element.…”

“…Largely due to the feasibility to produce refractory silicon nitride based ceramics containing oxynitride glasses as grain-boundary phases, a number of investigations have been carried out on oxynitride glass formation and properties [7][8][9]. Oxynitride glasses have since been prepared in systems including Y-Si-Al-O-N [10][11][12][13][14], Mg-Si-O-N [15,16], La-Si-O-N [17][18][19], Na-Ca-Si-O-N [20], Na-B-Si-O-N [21], Ca-Si-Al-O-N [22][23][24], Mg-Si-Al-O-N [8,24], Li-B-O-N [25], Na-B-O-N [25] and K-B-O-N [25].…”