Oxynitride glasses combine a high refractoriness, with Tg typically >850°C, and remarkable mechanical properties in comparison with their parent oxide glasses. Their Young's modulus and fracture toughness reach 170 GPa and 1.4 MPa m^.5, respectively. Most reports show good linear relationships between glass property values and nitrogen content. There is a clear linear dependence of Young's modulus and microhardness on fractional glass compactness (atomic packing density). They also have a better resistance to surface damage induced by indentation or scratch loading. The improvements stem from the increase of the atomic network cross-linking—because of three-fold coordinated nitrogen—and of the atomic packing density, despite nitrogen being lighter than oxygen and the Si–N bond being weaker than the Si–O bond. For constant cation composition, viscosity increases by ∼3 orders of magnitude as ∼17 eq.% oxygen is replaced by nitrogen. For rare earth oxynitride glasses with constant N content, viscosity, Young's modulus, Tg, and other properties increase with increasing cation field strength (decreasing ionic radius). Research continues to find lighter, stiffer materials, including glasses, with superior mechanical properties. With higher elastic moduli, hardness, fracture toughness, strength, surface damage resistance, increased high temperature properties, oxynitride glasses offer advantages over their oxide counterparts.

中文翻译：

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氧氮化物玻璃的机械性能

与母体氧化物玻璃相比，氮氧化物玻璃具有高耐火度（Tg 通常 >850°C）和卓越的机械性能。它们的杨氏模量和断裂韧性分别达到 170 GPa 和 1.4 MPa m ^.5， 分别。大多数报告显示玻璃性能值与氮含量之间存在良好的线性关系。杨氏模量和显微硬度与分数玻璃致密性（原子堆积密度）之间存在明显的线性相关性。它们还具有更好的抗压痕或划痕载荷引起的表面损伤的能力。尽管氮比氧轻且 Si-N 键弱于 Si-O 键，但改进源于原子网络交联的增加（由于三重配位氮）和原子堆积密度。对于恒定的阳离子组成，随着~17 eq.% 的氧气被氮气取代，粘度增加~3 个数量级。对于具有恒定 N 含量、粘度、杨氏模量、Tg 的稀土氮氧化物玻璃，和其他特性随着阳离子场强的增加（离子半径减小）而增加。研究继续寻找更轻、更硬的材料，包括具有优异机械性能的玻璃。凭借更高的弹性模量、硬度、断裂韧性、强度、表面抗损伤性、更高的高温性能，氧氮化物玻璃提供了优于其氧化物对应物的优势。