Abstract Yb3+ doped oxyfluorophosphate glasses with the composition (98.75) [90NaPO3-(10-x) Na2O-xNaF] - 1.25Yb2O3 (in mol%) with x = 0, 2.5, 5, 7.5 and 10 were prepared using a standard melting process. The progressive replacement of Na2O by NaF leads to an increase in the number of Q2 units at the expense of the Q1 units. This increase in the polymerization of the glass network leads to a shift of the optical band gap to lower wavelength, to a slight increase in the intensity of the emission at 1000 nm and more importantly to a change in the glass crystallization process. Indeed, both surface and bulk crystallization were observed in the glass with x = 0 while surface crystallization only occurs when NaF is added in the phosphate network. The heat treatment leads to the precipitation of at least three crystalline phases: as x increases, the NaPO3 phase grows at the expense of Na5P3O10. All glasses precipitate the Yb containing crystal, NaYbP2O7 which leads to an increase in the intensity of the emission at 1000 nm compared to the emission at 975 nm. We show for the first time to the best of our knowledge that transparent Yb3+ doped phosphate glass-ceramics can be obtained within this glass system when free of NaF.

中文翻译：

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透明 Yb3+ 掺杂磷酸盐微晶玻璃

摘要 使用标准熔化工艺制备了组成为 (98.75) [90NaPO3-(10-x) Na2O-xNaF] - 1.25Yb2O3（以摩尔%计）且 x = 0、2.5、5、7.5 和 10 的 Yb3+ 掺杂氧氟磷酸盐玻璃. NaF 逐渐取代 Na2O 导致 Q2 装置数量增加，但 Q1 装置的数量减少。玻璃网络聚合的这种增加导致光学带隙向较低波长移动，导致 1000 nm 处的发射强度略有增加，更重要的是导致玻璃结晶过程的变化。实际上，在 x = 0 的玻璃中观察到表面结晶和本体结晶，而表面结晶仅在磷酸盐网络中添加 NaF 时发生。热处理导致至少三个晶相的沉淀：随着 x 的增加，NaPO3 相的生长以 Na5P3O10 为代价。所有玻璃都会沉淀出含 Yb 的晶体 NaYbP2O7，与 975 nm 的发射相比，这导致 1000 nm 的发射强度增加。据我们所知，我们首次表明，在没有 NaF 的情况下，可以在该玻璃系统中获得透明的 Yb3+ 掺杂磷酸盐玻璃陶瓷。