Microhardness and Transparency of an La‐Si‐O‐N Oxynitride Glass

Abstract

An oxynitride glass containing 18 at.% N was prepared under high N2 pressure. The glass was transparent and very hard, with a Vickers hardness of 12.0 GPa.

La–Si–O–N glasses

“…18 Nitrogen contents reaching up to 18 at.% (38 e/o) have, however, been achieved by synthesis under a nitrogen gas pressure of 3 MPa. 31 The glass forming regions, and nitrogen contents, of oxynitride glasses are significantly increased upon adding Al as a component in the systems, e.g. up to ∼30 e/o of N can be incorporated in the La-Si-Al-O-N system.…”

Irradiation-induced changes in the local environment of Si and Al in LnSiAlON glasses as probed by 27Al and 29Si NMR

“…The substitution in this system of some divalent oxygen by trivalent nitrogen to produce oxynitride glasses leads to even better properties [8][9][10][11][12][13][14][15]. Ab-initio calculations of Young's modulus [16] and considerations on the cationic field strength of different network modifiers led to the choice of the Y-Mg-Si-Al-O-N vitreous system to study the nitrogen introduction effect on irradiation damage at the atomic scale.…”

Nitrogen-rich La–Si–Al–O–N oxynitride glass structures probed by solid state NMR

“…It has allowed us to prepare rare earth M-Si-(Al)-O-N glasses having both M/Si and N/O ratios as high as 1.5 and leading to N contents approaching 70 e/o. These values may be compared with oxynitride glasses prepared by conventional techniques, which typically give ratios M/Si < 1 and N/O < 0.3 (<30 e/o N) [2][3][4], with two notable exceptions of Ln-Si-O-N (Ln = La, Nd) glasses having $40 e/o N [8,9]. High flexibility in the incorporable amount of rareearth glass modifiers is desirable due to their effects on optical properties.…”