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RELATION BETWEEN LOCAL STRUCTURE AND FRAGILITY OP A VARIETY OF GLASS-FORMING LIQUIDS

机译：各种玻璃形成液的局部结构与易碎性之间的关系

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摘要

Viscosities and thermal properties of glasses in the systems Na_2O-SiO_2, Na_2O-GeO_2, Li_2O-TeO_2, and AgI-AgBO_2 were investigated at a temperature region of glass transformation. The measures of fragility, ΔCp and Eη/Tg, were increased with an increase in the alkali oxide content in the systems Na_2O-SiO_2 and Li_2O-TeO_2, indicating that these glasses became more fragile as non-bridging oxygens were increased. In the system Na_2O-GeO_2, on the other hand, both values were maximized at the composition with 20 mol%Na_2O, indicating that the fragility was maximized at the composition where the structure unit with higher coordination number, GeO_6, was maximized. In the system AgI-AgBO_2, although the value of ΔCp was decreased with an increase in the AgI content, the Eη/Tg value did not change with an increase in the AgI content. Such a result is probably caused by the fact that the portion of the glass network only contributes to the value of ΔCp.
机译：在玻璃化转变温度范围内，研究了Na_2O-SiO_2，Na_2O-GeO_2，Li_2O-TeO_2和AgI-AgBO_2体系中玻璃的粘度和热性能。随着Na_2O-SiO_2和Li_2O-TeO_2体系中碱金属氧化物含量的增加，脆性的测量值ΔCp和Eη/ Tg也增加，表明这些玻璃随着非桥连性氧的增加而变得更加脆弱。另一方面，在系统Na_2O-GeO_2中，两个值在具有20mol％Na_2O的组成中均最大化，表明在具有较高配位数的结构单元GeO_6最大化的组成中，脆性最大化。在系统AgI-AgBO_2中，尽管ΔCp的值随着AgI含量的增加而降低，但是Eη/ Tg值没有随着AgI含量的增加而变化。这样的结果可能是由于玻璃网络的一部分仅对ΔCp值起作用的事实引起的。

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  • 来源
  • 会议地点 Beijing(CN)
  • 作者

    Tsutomu Minami; Sang-Ki Lee; Masahiro Tatsumisago;

  • 作者单位

    Department of Applied Materials Science, Osaka Prefecture University, Sakai, Osaka 593, Japan;

    Department of Applied Materials Science, Osaka Prefecture University, Sakai, Osaka 593, Japan;

    Department of Applied Materials Science, Osaka Prefecture University, Sakai, Osaka 593, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 玻璃工业;
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