In‐situ determination of the HfO 2 –Ta 2 O 5 ‐temperature phase diagram up to 3000°C
In‐situ determination of the HfO 2 –Ta 2 O 5 ‐temperature phase diagram up to 3000°C
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DOI：
10.1111/jace.16271
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发表时间：
2019-08
影响因子：
3.9
通讯作者：
S. McCormack;K. Tseng;R. Weber;D. Kapush;S. Ushakov;A. Navrotsky;W. Kriven
中科院分区：
文献类型：
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作者：
S. McCormack;K. Tseng;R. Weber;D. Kapush;S. Ushakov;A. Navrotsky;W. Kriven
以前未知的实验HfO2-Ta2O5-温度相图已经使用配备了CO2激光器的四极灯熔炉和锥形喷嘴悬浮系统与同步加速器X射线衍射相结合，在高达3000°C的范围内得到了阐明。通过这些原位技术，可以确定下列参数：(A)从热停滞实验中得到的相变温度与组成的函数关系；(B)通过原位X射线衍射测试可逆性来确定平衡相；(C)测量平衡相的摩尔体积与温度的函数关系。由此建立了符合Gibbs相律的HfO2-Ta2O5实验相图。
The previously unknown experimental HfO2–Ta2O5‐temperature phase diagram has been elucidated up to 3000°C using a quadrupole lamp furnace and conical nozzle levitator system equipped with a CO2laser, in conjunction with synchrotron X‐ray diffraction. These in‐situ techniques allowed the determination of the following: (a) liquidus, solidus, and invariant transformation temperatures as a function of composition from thermal arrest experiments, (b) determination of equilibrium phases through testing of reversibility via in‐situ X‐ray diffraction, and (c) molar volume measurements as a function of temperature for equilibrium phases. From these, an experimental HfO2–Ta2O5‐temperature phase diagram has been constructed which is consistent with the Gibbs Phase Rule.