Investigation on thermal and microstructural characterization of the TeO2–WO3 system
Investigation on thermal and microstructural characterization of the TeO2–WO3 system
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TeO2-WO3 体系的热学和微观结构表征研究
DOI：
10.1016/j.jallcom.2011.02.109
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发表时间：
2011
影响因子：
6.2
通讯作者：
S. Aydin
中科院分区：
文献类型：
--
作者：
M. Çelikbilek;A. Ersundu;N. Solak;S. Aydin
通过应用差热分析 (DTA)、X 射线衍射 (XRD) 和扫描电子显微镜 (SEM) 技术，完成了 TeO2-WO3 二元系统的热和微观结构表征。研究了 (1−x)TeO2-xWO3 系统的不同组成，其中 x 的摩尔比在 0.02 和 0.80 之间变化。样品是通过将 TeO2 和 WO3 的高纯度粉末混合物在带有密闭盖子的铂坩埚中在 750°C 下熔化 30 分钟并在水浴中淬火来制备的。检测到二元体系的玻璃形成范围以摩尔比计为0.04≤x≤0.35。将铸态样品在 550°C 的结晶峰值温度以上热处理 24 小时以获得热稳定性，并通过对热处理样品进行系统的热、相和微观结构表征来研究二元系统的相稳定性。在617±3℃下检测到二元系的共晶反应，在743±1℃下检测到吸热反应，表明WO3从斜方晶系到四方晶系的相变反应。当实现完全结晶时，发现最终结构中存在α-TeO2 和斜方WO3 晶相。在文献中首次实现了广泛成分范围的 TeO2-WO3 体系的微观结构表征。
Thermal and microstructural characterization of the TeO2–WO3binary system was accomplished by applying differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. Different compositions of the (1−x)TeO2–xWO3system, where x varies between 0.02 and 0.80 in molar ratio were studied. The samples were prepared by melting high purity powder mixtures of TeO2and WO3in a platinum crucible with a closed lid at 750°C for 30min and quenching in water bath. The glass forming range of the binary system was detected as 0.04≤x≤0.35 in molar ratio. As-cast samples were heat-treated above the crystallization peak temperatures at 550°C for 24h to obtain thermal stability and the phase stability of the binary system was investigated by performing systematical thermal, phase and microstructural characterizations with the heat-treated samples. The eutectic reaction of the binary system was detected at 617±3°C, the endothermic reaction indicating the phase transformation reaction of WO3from orthorhombic to tetragonal was determined at 743±1°C. α-TeO2and orthorhombic WO3crystalline phases were found to be present in the final structure when the total crystallization was achieved. Microstructural characterization of the TeO2–WO3system was realized for a wide compositional range for the first time in the literature.