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首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >DSC thermal anomalies in the glass transition temperature domain for a boron oxyfluoride (BOF) glass
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DSC thermal anomalies in the glass transition temperature domain for a boron oxyfluoride (BOF) glass

机译：氟氧化硼（BOF）玻璃在玻璃化转变温度域中的DSC热异常

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摘要

Heat capacity measurements by DSC in the glass transition domain of BO_(1.34)F_(0.32) glass have allowed the determination of two glass transition temperatures T_g on heating up to (T_g+80)K. This result is in good agreement with a previous structural characterisation of a BO_(1.32)F_(0.36) glass by NMR, thus demonstrating the appearance of new polyhedral species near T_g and the formation of BF_3 trapped in the glass matrix. The difference between the heat capacities of the solid and the liquid phases, 0.8 J/gK, reveals the fragile character of the melt.The structural, physical and chemical characteristics of B_2O_3 based glasses have been extensively studied because of the good glass forming character of this oxide.~(1) In the ternary phase diagram B-O-F, the only well known compounds are BF_3 and B_2O_3. When BF_3 and B_2O_3 are heated in a closed volume, a glass phase is formed. These BOF glasses have not only been characterised by NMR and mass spectroscopies, but their structures have been studied by computer simulation.~(1-3) Their exact compositions were determined by chemical and charged particle activation energy methods and are well represented by the following formula BO_(1.5-0.5x)F_X, x varying between 0.2 and 0.6.
机译：通过DSC在BO_（1.34）F_（0.32）玻璃的玻璃化转变域中进行的热容测量，可以确定加热到（T_g + 80）K时的两个玻璃化转变温度T_g。该结果与先前通过NMR对BO_（1.32）F_（0.36）玻璃的结构表征非常吻合，从而证明了在T_g附近出现了新的多面体物种，并在玻璃基质中形成了BF_3。固相和液相的热容之差0.8 J / gK揭示了熔体的脆性。由于B_2O_3基玻璃具有良好的玻璃形成特性，因此对其结构，物理和化学特性进行了广泛的研究。 〜（1）在三元相图BOF中，唯一已知的化合物是BF_3和B_2O_3。当BF_3和B_2O_3在封闭的体积中加热时，形成玻璃相。这些BOF玻璃不仅通过NMR和质谱进行了表征，而且通过计算机模拟研究了它们的结构。〜（1-3）通过化学和带电粒子活化能方法确定了它们的确切组成，并通过以下方式很好地表示公式BO_（1.5-0.5x）F_X，x在0.2到0.6之间变化。

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