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首页> 外文学位 >Structural characterization of rare-earth doped soda magnesia alumina silica glasses for holographic storage: Brillouin, Raman and NMR spectroscopy studies.
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Structural characterization of rare-earth doped soda magnesia alumina silica glasses for holographic storage: Brillouin, Raman and NMR spectroscopy studies.

机译：全息照相存储用稀土掺杂苏打氧化镁铝硅玻璃的结构表征：布里渊，拉曼和NMR光谱研究。

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摘要

Scope and method of study. This work was directed to perform (Brillouin and Raman) light scattering and (29Si, 27Al, 23Na) MAS NMR spectroscopies to study structural, vibrational, elastic, photoelastic and magnetic properties of Eu3+ -doped soda magnesia alumina silica (EDSMAS) glasses as a function of content of individual components: Eu2O3, Al 2O3 and Na2O to provide new knowledge related to the mechanism underlying the formation of holographic gratings in these materials.; Findings and conclusions. Europium doping and alumina substitution for silica causes glass to become harder but at the same time more polarizable. In both glass series the enhanced hardness is due to reduction of the free space. In addition, in the former case the europiums have high coordination and enhanced field strength with oxygen atoms. In the latter one, the aluminums entering the glass recover Si-O-Si bridges by attracting charge balancing modifiers from depolymerized SiO4 network. Growing polarizability in Eu- and Al-series is mostly due to depolymerization by Eu 3+ doping and the appearance of AlO4 tetrahedral groups weakly bound to sodium ions, respectively. The Eu3+ ions form the broad distribution of Qn species with possible clustering of rare-earths at large Eu3+ ion concentration, while sodium ions entering the glass cause the formation of rather distinct Qn species. In Na-series the glass becomes more depolymerized although less compressible in the volumetric sense . In this series Na environment is sensitive to the first neighbor Na+ network-modifiers. The overall bonding in all three EDSMAS glass series becomes more polarizable compared to fused silica. The depolymerization (polymerization) of the EDSMAS glass is mainly characterized by the presence of NBOs (BOs) and three (four) member silicate and aluminosilicate rings. Si and Al atoms were found to be in tetrahedrally coordinated sites. No Al was observed in 6- or 5-fold coordinated sites. Lorentz-Lorentz effect was the dominant contribution to the photoelastic constant P 12. The strength of the holographic storage signal is defined by many factors among which the number of the excited Eu3+ ions, the high-energy phonons associated with Si-NBO vibrations, weakly bound Na+ ions charge balancing [AlO4]− complexes and the stability of the traps for the mobile light ions play very important roles.
机译：研究范围和方法。该工作旨在进行（布里渊和拉曼）光散射和（ 29 Si， 27 Al， 23 Na）MAS NMR光谱学研究掺Eu 3+ 的钠镁铝硅玻璃（EDSMAS）玻璃的结构，振动，弹性，光弹性和磁性能与单个组分Eu 2 O含量的关系 3 ，Al 2 O 3 和Na 2 O提供有关基础形成机理的新知识这些材料中的全息光栅。 发现和结论。 silica掺杂和氧化铝对二氧化硅的替代使玻璃变得更坚硬，同时极化性更大。在两个玻璃系列中，硬度的增加都是由于自由空间的减少。此外，在前一种情况下，have与氧原子的配位高，场强增强。在后一种中，进入玻璃的铝通过吸引解聚的SiO 4 网络中的电荷平衡改性剂来回收Si-O-Si桥。 Eu和Al系列中极化率的增长主要归因于Eu 3 + 掺杂的解聚作用以及AlO 4 四面体基团的弱结合钠离子。 Eu 3 + 离子形成Q n 物种的广泛分布，并且在大Eu 3+ < / super>离子浓度，而进入玻璃的钠离子则导致形成相当不同的Q n 物种。在Na系列中，玻璃的解聚程度更高，尽管在体积意义上可压缩性较低。在这个系列中，Na环境对第一个邻居Na + 网络修饰符敏感。与熔融石英相比，所有三个EDSMAS玻璃系列的整体粘合性都更加极化。 EDSMAS玻璃的解聚（聚合）主要特征在于存在NBO（BO）和三（四）元硅酸盐和硅铝酸盐环。发现Si和Al原子在四面体配位位置。在6或5倍配位位点未观察到Al。 Lorentz-Lorentz效应是光弹性常数 P 12 的主要贡献。全息存储信号的强度由许多因素决定，其中受激发的Eu 3 + 离子的数量，与Si-NBO振动相关的高能声子，弱结合的Na + 离子的电荷平衡[AlO 4 ] -络合物和移动轻离子陷阱的稳定性起着非常重要的作用。

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  • 作者

    Utegulov, Zhandos Nurpeisovich.;

  • 作者单位

    Oklahoma State University.;

  • 授予单位 Oklahoma State University.;
  • 学科 Physics Condensed Matter.; Physics Optics.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 145 p.
  • 总页数 145
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;
  • 关键词

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