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首页> 外文期刊>Physica, C. Superconductivity and its applications >Determination of HF partial pressure during ex situ conversion of YBCO precursors
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Determination of HF partial pressure during ex situ conversion of YBCO precursors

机译：YBCO前体异位转化过程中HF分压的测定

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The importance of HF gas behavior during ex situ YBCO formation is well known, however no experimental data on the partial pressure of HF gas exists due to difficulties in measuring this fundamental quantity. The objective of this study is to measure the partial pressure of HF above TFA-MOD derived coated conductor during processing. The method used was based on a modified Knudsen cell technique. Fluorine loss from the Knudsen cell was monitored by measuring residual fluorine in quenched films. Fluorine loss showed two separate regimes corresponding to the oxidation of YF3 and of BaF2. The partial pressure of HF was measured at 525, 575 and 625 degrees C. Partial pressures of HF measured at 575 degrees C were 0.16 +/- 0.02 Pa for the YF3 reaction and 0.02 +/- 0.002 Pa for the BaF2 reaction. Measured pressures gave Delta G values of the reactions, which were compared to calculated values for several possible reactions that literature suggests can occur during the processing. Experimental results indicate the most probable reaction for each step. (c) 2005 Elsevier B.V. All rights reserved.
机译：异位YBCO形成过程中HF气体行为的重要性是众所周知的，但是由于很难测量该基本量，因此不存在有关HF气体分压的实验数据。这项研究的目的是在加工过程中测量HF在TFA-MOD衍生的涂层导体上方的分压。所使用的方法基于改良的Knudsen细胞技术。通过测量淬火膜中的残留氟来监测Knudsen池中的氟损失。氟的损失显示出两个独立的状态，分别对应于YF3和BaF2的氧化。在525、575和625℃下测量HF的分压。对于YF3反应，在575℃下测量的HF的分压为0.16 +/- 0.02Pa，对于BaF2反应为0.02 +/- 0.002Pa。测得的压力给出了反应的Delta G值，将其与文献中暗示可能在加工过程中发生的几种可能反应的计算值进行了比较。实验结果表明每个步骤最可能的反应。 （c）2005 Elsevier B.V.保留所有权利。

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