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Nucleation efficiency of erbium and ytterbium fluorides in transparent oxyfluoride glass-ceramics

机译:透明氟氧化物玻璃陶瓷中氟化er和fluoride的成核效率

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摘要

Oxyfluoride glasses (GeO_2-PbO-PbF_2) doped with erbium and/or ytterbium fluorides were prepared. Highly transparent glass-ceramics, containing beta-PbF_2 nanocrystallites, were successfully obtained by controlled glass devitrification and were studied as they could lead to promising optical applications. To characterize the samples, differential thermal analysis, x-ray diffraction, and transmission electron microscopy were performed, revealing a variation of the crystallites size, the crystallites number and P~PbF_2 crystallization temperature according to the doping ion. Indeed, the analyses indicated differences between erbium and ytterbium fluorides in promoting the crystallization of the fluoride phase. Although both fluorides act as seeds for beta-PbF_2 heterogeneous nucleation, erbium fluoride has higher nucleation efficiency than ytterbium fluoride and runs the nucleation process in co-doped samples. Energy dispersive x-ray microanalysis insured high rare-earth segregation into the crystallites, proving the formation of a solid solution Pb_(1-x-y)Er_xYb_yF_(2+x+y), also confirmed by the unit cell parameter study.
机译:制备了掺有氟化and和/或y的氟氧化物玻璃(GeO_2-PbO-PbF_2)。含β-PbF_2纳米微晶的高透明玻璃陶瓷是通过受控的玻璃失透技术成功获得的,并进行了研究,因为它们可能导致有希望的光学应用。为了表征样品,进行了差示热分析,X射线衍射和透射电子显微镜,揭示了根据掺杂离子的微晶尺寸,微晶数和P〜PbF_2结晶温度的变化。确实,分析表明氟化promoting和氟化s在促进氟化物相结晶方面的差异。尽管两种氟化物都充当β-PbF_2异质成核的种子,但氟化比氟化y具有更高的成核效率,并且可以在共掺杂样品中进行成核过程。能量色散X射线显微分析确保了高稀土偏析到微晶中,证明形成了固溶体Pb_(1-x-y)Er_xYb_yF_(2 + x + y),这也得到了晶胞参数研究的证实。

著录项

  • 来源
    《Journal of Materials Research》 |2005年第2期|p.472-481|共10页
  • 作者单位

    Laboratoire de Chimie Appliquee de I'Etat Solide, CNRS-UMR 7574, ENSCP 75005 Paris, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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