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

机译：氧氟氢玻璃和玻璃中Pr3 +掺杂Laf3纳米晶体的自动增长

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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 glassceramic with composition 16.52Al(2)O(3)center dot 1.5 AlF3 center dot 12.65LaF(3)center dot 4.33Na(2)O center dot 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氧化玻璃陶瓷是光电子中的重要材料。在本研究中，我们报告了用组合物的玻璃和玻璃制备16.52Al（2）O（3）中心点1.5 Alf3中心点12.65LAF（3）中心点4.33NA（2）O中心点64.85 SiO2（摩尔％），其中两种材料掺杂有1mol％PR2O3。所有四种物种都是通过透射电子显微镜（TEM）的结构形式的特征。与未掺杂的玻璃相比，PR2O3影响了玻璃中的相分离和延迟结晶。通过先进的茎/ EDX技术确定玻璃/玻璃陶瓷中各种组分的结晶机理和位置。母玻璃中的相分离区域主要由F和La填充，也由Pr，Al和Si填充。退火后的相分离液滴变成10-20nm LaF3纳米晶体，其发现部分地包括晶体本身中的掺杂Pr3 +离子。 EDX彻底表征了间晶体/玻璃状基质。结果表明，内LAF3晶体芯通过富含Si的Al富集的层吞噬，其作为外芯。该发现还表明晶体表面过于粘性，以进一步增强晶体生长，因此整体晶体形成限于纳米型。

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  • 来源
    《RSC Advances》 |2017年第24期|共8页
  • 作者

    Mallik Amit; Barik Anil K.; Pal Biswajit;

  • 作者单位

    Siliguri Coll Dept Chem Darjeeling 734001 India;

    St Pauls Cathedral Mission Coll Dept Chem 33-1 Raja Rammohan Roy Sarani Kolkata 700009 India;

    St Pauls Cathedral Mission Coll Dept Chem 33-1 Raja Rammohan Roy Sarani Kolkata 700009 India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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