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In‐situ determination of the HfO2–Ta2O5‐temperature phase diagram up to 3000°C

McCormack, Scott J. ; Tseng, Kuo‐Pin ; Weber, Richard J. K. ; Kapush, Denys ; Ushakov, Sergey V. ; Navrotsky, Alexandra ; Kriven, Waltraud M.

Journal of the American Ceramic Society, 2019-08, Vol.102 (8), p.4848-4861 [Periódico revisado por pares]

Columbus: Wiley Subscription Services, Inc

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Título:
In‐situ determination of the HfO2–Ta2O5‐temperature phase diagram up to 3000°C
Autor: McCormack, Scott J. ; Tseng, Kuo‐Pin ; Weber, Richard J. K. ; Kapush, Denys ; Ushakov, Sergey V. ; Navrotsky, Alexandra ; Kriven, Waltraud M.
Assuntos: Carbon dioxide ; Carbon dioxide lasers ; Conical nozzles ; Hafnium oxide ; Liquidus ; Molar volume ; Phase diagrams ; Phase rule ; Quadrupoles ; Solidus ; Tantalum ; Tantalum oxides ; Temperature ; Transformation temperature ; X-ray diffraction
É parte de: Journal of the American Ceramic Society, 2019-08, Vol.102 (8), p.4848-4861
Descrição: 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 CO2 laser, 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. HfO2–Ta2O5‐Temperature phase space built based on the observed equilibrium phases from in situ X‐ray powder diffraction and the Gibbs Phase Rule.
Editor: Columbus: Wiley Subscription Services, Inc
Idioma: Inglês

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In‐situ determination of the HfO2–Ta2O5‐temperature phase diagram up to 3000°C

McCormack, Scott J. ; Tseng, Kuo‐Pin ; Weber, Richard J. K. ; Kapush, Denys ; Ushakov, Sergey V. ; Navrotsky, Alexandra ; Kriven, Waltraud M.

Columbus: Wiley Subscription Services, Inc

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