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arXiv 1802.07467cond-mat.supr-con
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溶液衍生YBCO超导薄膜沉积中BaF2中间相的热力学分析

Thermodynamics analysis on BaF2 intermediate phase in solution-derived YBCO superconducting film deposition

Feng Feng, Hongyuan Lu, Wei Wu, Xiangsong Zhang, Linli Wang

摘要:

在化学溶液沉积法制备YBa_2Cu_3O_(7-δ)(YBCO)高温超导薄膜中,BaF_2是热处理过程中的重要中间相。本文通过计算700-1000 K温度范围内BaF 2与其它中间相反应的标准吉布斯自由能变化(ΔGT),分析了BaF 2的热力学稳定性。采用热力学方法,吉布斯自由能函数法和标准生成摩尔吉布斯自由能法计算了ΔGT值。在较高温度下,BaF 2相对于其它中间相优先生成,而在700 K时,BaCO 3有生成的可能。

英文摘要:

In the YBa2Cu3O7-δ (YBCO) high temperature superconducting thin film fabrication via the chemical solution deposition method, BaF2 is an important intermediate phase during heat treatment. In this paper, BaF2 thermodynamics stability was analyzed through calculating the standard Gibbs free energy change (ΔGT) of the reactions related to other intermediate phases within the temperature range of 700-1000 K. Two thermodynamics methods, the Gibbs free energy function method and standard formation molar Gibbs free energy method, were utilized to obtain the ΔGT values. The formation priority of BaF2 relative to other intermediate phases were verified at higher temperatures, while the possibility of BaCO3 formation was found at 700 K.

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