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首页> 外文期刊>RSC Advances >Retracted Article: Self-limited growth of Pr3+-doped LaF3 nanocrystals in oxyfluoride glass and glass-ceramics
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Retracted Article: Self-limited growth of Pr3+-doped LaF3 nanocrystals in oxyfluoride glass and glass-ceramics

机译：缩回文章：氟氧化玻璃和玻璃陶瓷中Pr 3 + 掺杂的LaF 3 纳米晶体的自限生长

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摘要

Transparent oxyfluoride glass-ceramics of heavy metals doped with rare earth metal ions are important materials in optoelectronics. In the present study, we report the preparation of a glass and a glass-ceramic with composition 16.52Al2O3·1.5 AlF3·12.65LaF3·4.33Na2O·64.85 SiO2 (mol%), where both the materials were doped with 1 mol% Pr2O3. All four species were structurally characterized by Transmission Electron Microscopy (TEM). Pr2O3 affected the phase separation in the glass and deferred crystallization compared to the undoped glass. The crystallization mechanism and the location of various components in the glass/glass-ceramics were ascertained through advanced STEM/EDX techniques. The phase separated regions in the mother glass were mostly populated by F and La and also by Pr, Al and Si. The phase separated droplets, after annealing, turned into 10–20 nm LaF3 nanocrystals, which were found to partly include the doping Pr3+ ions in the crystals themselves. The interphase crystal/glassy matrix was thoroughly characterized by EDX. The results suggest that the inner LaF3 crystal core is engulfed by an Al enriched layer that follows a Si enriched surrounding shell as the outer core. This finding also indicates that the crystal surface is too viscous to further enhance the crystal growth, and therefore the overall crystal formation is limited to the nanosize.
机译：掺杂有稀土金属离子的重金属透明的氟氧化物玻璃陶瓷是光电子学中的重要材料。在本研究中，我们报告了组成为16.52Al 2 O 3 的玻璃和玻璃陶瓷的制备small>·1.5 AlF 3 ·12.65LaF 3 ·4.33Na 2 O·64.85 SiO 2 （摩尔％），其中两种材料均掺杂有1 mol％Pr 2 O 3 。通过透射电子显微镜（TEM）对这四个物种进行了结构表征。与未掺杂的玻璃相比，Pr 2 O 3 影响了玻璃中的相分离并延迟了结晶。通过先进的STEM / EDX技术确定了玻璃/玻璃陶瓷中的结晶机理和各种成分的位置。母玻璃中的相分离区域主要由F和La以及Pr，Al和Si组成。退火后，相分离的液滴变成10–20 nm LaF 3 纳米晶体，发现部分包含掺杂Pr 3+ <晶体本身中的/ sup> 离子。用EDX对相间晶体/玻璃状基质进行了彻底表征。结果表明，内部LaF 3 晶体核被Al富集层吞没，该Al富集层以富含Si的包围壳为外部核。该发现还表明晶体表面太粘而不能进一步增强晶体生长，因此总的晶体形成限于纳米尺寸。

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