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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Unexpectedly high compressibility of Na6Al2Si6O18 glass with a large excess of Na2O relative to Al2O3 (Na2O/Al2O3=3) in the pressures range up to 6.0 GPa
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Unexpectedly high compressibility of Na6Al2Si6O18 glass with a large excess of Na2O relative to Al2O3 (Na2O/Al2O3=3) in the pressures range up to 6.0 GPa

机译：在压力范围内，相对于Al2O3（Na 2 O / Al2O3 = 3）的大量过量的Na6Al2Si6O18玻璃的强压缩性高达6.0GPa

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摘要

The refractive index and the relative changes in the density (compressibility) for Na6Al2Si6O18 glass, with the ratio [Na2O]/([Na2O] -[Al2O3])=0.75, in the pressure range up to 6.0 GPa were obtained using a polarization-interference microscope, an apparatus with diamond anvils and the theory of photoelasticity. The experimentally obtained compressibility, (d-d(0))/d, of Na6Al2Si6O18 glass is higher than one would expect from the glass with a large excess of Na2O relative to Al2O3 (Na2O/Al2O3=3). This phenomenon is discussed in the light of the quantitative mismatch of modifier cations and voids in the glass network and the existence of micmheterogeneity due to the formation of microcrystalline sodium-rich areas with a low degree of polymerization. Highly polymerized regions, rich in silicon- and aluminum-containing structural units, are responsible for the compressibility of glass. The calculated degree of depolymerization in these regions, NBO/T = 0.28, corresponds to the experimentally obtained compressibility of Na6Al2Si6O18 glass.
机译：利用偏振干涉显微镜、金刚石砧装置和光弹性理论，获得了[Na2O]/（[Na2O]-[Al2O3]）=0.75的Na6Al2Si6O18玻璃在高达6.0GPa的压力范围内的折射率和密度（可压缩性）的相对变化。实验获得的Na6Al2Si6O18玻璃的可压缩性（d-d（0））/d高于人们对Na2O相对Al2O3过量（Na2O/Al2O3=3）玻璃的预期。根据玻璃网络中改性剂阳离子和空隙的数量不匹配，以及由于形成低聚合度的微晶富钠区域而存在微异质性，讨论了这一现象。高度聚合的区域富含含硅和铝的结构单元，对玻璃的可压缩性负责。计算出的这些区域的解聚度NBO/T=0.28，对应于实验获得的Na6Al2Si6O18玻璃的可压缩性。

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