Effect of ZnO on the Thermal Properties of Tellurite Glass
Effect of ZnO on the Thermal Properties of Tellurite Glass
复制标题
ZnO对亚碲酸盐玻璃热性能的影响
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
A. Shaari
中科院分区：
文献类型：
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作者：
H. Sidek;S. Rosmawati;B. Azmi;A. Shaari
采用传统的熔铸-淬冷技术成功地制备了二元碲锌酸盐玻璃系列（摩尔分数为0.4，间距为0.05）。以丙酮为浮力液体，用阿基米德法测定了它们的密度。使用L75 D1250膨胀计测定各锌碲酸盐玻璃的热膨胀系数，使用SETARAM Labsys DTA/6差示热重分析法，以20 K min-1的加热速度求出玻璃化转变温度（λ）。基于在每个玻璃样品中传播的纵向（）和剪切超声波（）速度来估计声学德拜温度和软化温度（）。对于玻璃样品的超声速度测量，使用MATEC MBS 8000超声数据采集系统。所有测量均在10 MHz频率和室温下进行。所有的二元碲酸盐玻璃的热性能作为ZnO组合物的函数进行测量。ZnO改性剂，预期改变碲酸盐玻璃的热性能的组成依赖性进行了讨论。实验结果表明，随着ZnO含量的增加，碲酸盐玻璃的密度和热膨胀系数增加，而玻璃化转变温度、德拜温度和软化温度降低，这是由于网络形成原子的配位数（CN）发生变化，以及非桥氧（NBO）原子的形成破坏了网络结构.
Systematic series of binary zinc tellurite glasses in the form (where to 0.4 with an interval of 0.05 mole fraction) have been successfully prepared via conventional melt cast-quenching technique. Their density was determined by Archimedes method with acetone as buoyant liquid. The thermal expansion coefficient of each zinc tellurite glasses was measured using L75D1250 dilatometer, while their glass transition temperature () was determined by the SETARAM Labsys DTA/6 differential thermogravimetric analysis at a heating rate of 20 K min−1. The acoustic Debye temperature and the softening temperature () were estimated based on the longitudinal () and shear ultrasonic () wave velocities propagated in each glass sample. For ultrasonic velocity measurement of the glass sample, MATEC MBS 8000 Ultrasonic Data Acquisition System was used. All measurements were taken at 10 MHz frequency and at room temperature. All the thermal properties of such binary tellurite glasses were measured as a function of ZnO composition. The composition dependence was discussed in terms of ZnO modifiers that were expected to change the thermal properties of tellurite glasses. Experimental results show their density, and the thermal expansion coefficient increases as more ZnO content is added to the tellurite glass network, while their glass transition, Debye temperature, and the softening temperature decrease due to a change in the coordination number (CN) of the network forming atoms and the destruction of the network structure brought about by the formation of some nonbridging oxygen (NBO) atoms.