Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Physico-Chemical Properties of $Tl_2O-B_2O_3-SiO_2$ Glasses and Their Phase Separations

$Tl_2O-B_2O_3-SiO_2$ 系 유리의 物理化學的 性質 및 그의 分相

  • Kim, Kee-Hyong (Airco Speer Research a Division of Air Reduction Company. Inc.)
  • Published : 19680600
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Abstract

The physico-chemical properties of nine selected thallium borosilicate glasses and other 21 supplementary compositions were investigated. Their composition-property curves are found to be in many respects analogous to those of other borosilicate glasses containing lithia, soda, and lead oxide. It is indicated that certain minima found in the composition-property curves of thallium borosilicate glasses might be caused by a change in boron coordination as has been observed to occur in the $Na_2O-B_2O_3-SiO_2$ glasses. Typical effects of thallium ions on the borosilicate glass are summarized as follows: 1) Addition of thallium ions increased density, refractive index, water solubility, linear coefficient of thermal expansion, and dielectric constant. 2) Increased concentration of thallium decreased the softening point of the glasses, caused fluorescence under ultraviolet radiation and smeared out the absorption edges up to $15{\mu}$ in the infrared region. An extensive liquid immiscibility was found by replication electron microscope technique in the $Tl_2O-B_2O_3-SiO_2$ system. The immiscibility covers a composition range roughly from 55 wt. % Tl2O to the binary system $B_2O_3-SiO_2.$ By acid treatment, it was found that the immiscible glass consists of separate silica-rich and boron-rich phases.

9種의 選擇된 탈리움硼硅酸유리와 21種의 同類組成을 變化시킨 유리에 對하여 物理化學的 性質을 檢討하였다. 이들 組成에 依한 性質의 變化曲線은 여러 點에서 酸化리티움, 소다 및 酸化鉛들을 包含하는 다른 硼硅酸유리와 類似하였다. 탈리움 硼硅酸유리의 組成에 따른 成質의 變化曲線에 極少點이 나타났는데, 이는 $Na_2O-B_2O_3-SiO_2$유리에서 關察된 바와 같이 硼素結合의 變化에 基因되는 것 같다. 탈리움 이온이 硼硅酸유리에 미치는 主 影響을 綜合해 보면 다음과 같다. 1) 탈리움 이온을 添加함으로써 密度, 屈折率, 물에 對한 溶解度, 熱線膨脹係數, 誘電恒數 等이 增加되었다. 2) 탈리움 濃度을 增加시킴으로써 유리의 軟化點이 降下되었고, 紫外線 照射에 依하여 螢光이 생겼으며, 赤外線 $15{\mu}$까지의 吸收端이 不明確해 졌다. $Tl_2O-B_2O_3-SiO_2$ 系에서 廣範한 液體不混合性이 電子顯微鏡에 依해 밝혀졌다. 不混合性은 $B_2O_3-SiO_2$ 二成分系에 對하여 約 $Tl_2O$ 55wt.%의 組成範圍內에서 나타났다. 不混合性유리는 多硅酸과 多硅素相으로 分離 構成되어 있음이 酸處理에 依하여 밝혀졌다.

Keywords

References

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