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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 >Thermal expansion and transition temperature of glasses in the systems BeO–Al2O3–B2O3 and MgO–Al2O3–B2O3
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Thermal expansion and transition temperature of glasses in the systems BeO–Al2O3–B2O3 and MgO–Al2O3–B2O3

机译：BeO–Al2O3–B2O3和MgO–Al2O3–B2O3系统中玻璃的热膨胀和转变温度

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摘要

Researches were conducted for glasses in the systems BeO–Al2O3–B2O3 and MgO–Al2O3–B2O. The following characteristics have been determined: thermal expansion coefficient within 20–300 °C, structural thermal expansion coefficient (STEC) and glass transition temperature. The discussed properties of Be-aluminoborate and Mg-aluminoborate glasses have been compared with those of Ca-, Sr- and Ba-aluminoborate glasses. TEC of studied glasses gets higher going from Be-aluminoborate glasses to Ba-aluminoborate ones, but Tg decreases under the same succession. The dependence of STEC on the nature of a given cation is more complicated. The pattern of dependence of the properties on composition is due to changing the boron coordination number with respect to oxygen, which is the main network-former, and to competition between the aluminium and boron for the oxygen brought by an ion-modifier. The difference between the effect of one ion-modifier and that of another is determined by decreasing the radius of an ion and increasing its electric field strength in the succession from Ba2+ to Be2+. The ions of Be and Mg can also act as network-former to some extent.
机译：在BeO–Al2O3–B2O3和MgO–Al2O3–B2O系统中对玻璃进行了研究。确定了以下特性：20–300°C内的热膨胀系数，结构热膨胀系数（STEC）和玻璃化转变温度。已将Be-aluminoborate和Mg-aluminoborate玻璃的讨论性能与Ca-，Sr-和Ba-aluminoborate玻璃的性能进行了比较。从Be-aluminoborate眼镜到Ba-aluminoborate眼镜，TEC的TEC更高，但在相同的继承下Tg降低。 STEC对给定阳离子性质的依赖性更加复杂。性质对组成的依赖性的模式是由于相对于氧（主要的网络形成剂）改变了硼的配位数，以及铝和硼之间对离子改性剂带来的氧的竞争。通过减小离子的半径并增加从Ba2 +到Be2 +的离子强度，可以确定一种离子改性剂与另一种离子改性剂的效果之间的差异。铍和镁离子也可以在某种程度上充当网络形成者。

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