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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Thermodynamics of nitrogen-rich uranium sesquinitride formation by reaction of uranium monocarbide with ammonia
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Thermodynamics of nitrogen-rich uranium sesquinitride formation by reaction of uranium monocarbide with ammonia

机译：一碳化铀与氨反应形成富氮的次生氮化铀的热力学

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According to our thermodynamic analysis, the flowing NH3 possesses high nitrogen and hydrogen activities due to its instability with respect to the dissociation equilibrium, NH3 reversible arrow (1/2)N-2 + (3/2)H-2. As the extent of dissociation of NH3 into N-2 and H-2, alpha, is lower, nitrogen and hydrogen activities exhibited by unstable gaseous mixture of NH3, N-2 and H-2 become higher. The reaction experiments of UC with a stream of NH3 at 600, 700, 800 and 900 degrees C were performed at two different values of alpha. Some runs employed 1 g UC as the starting material and the others used 2 g UC. At each of these four temperatures two runs were performed under the same experimental conditions except for the difference of the amount of used UC. The experimental results that the extent of dissociation, a, is larger in the case of using 2 g UC than in the case of using 1 g UC may suggest that the extent of NH3 dissociation is greatly influenced by the amount of UC as the starting material. It was found that the gaseous phase consisting of NH3, N-2 and H-2 with lower alpha yields U2N3 + x with higher N/U ratio at a given temperature. These experimental results are consistent with our thermodynamic analysis. (C) 1998 Elsevier Science S.A. [References: 9]
机译：根据我们的热力学分析，流动的NH3相对于解离平衡不稳定，NH3可逆箭头（1/2）N-2 +（3/2）H-2具有较高的氮和氢活性。随着NH3分解为N-2和H-2（α）的程度降低，由NH3，N-2和H-2的不稳定气态混合物表现出的氮和氢活性变得更高。 UC在600、700、800和900摄氏度下与NH3物流进行的反应实验是在两个不同的α值下进行的。一些运行使用1 g UC作为起始原料，而其他运行使用2 g UC。在这四个温度中的每个温度下，在相同的实验条件下进行了两次运行，只是所用的UC量不同。实验结果表明，使用2 g UC的情况下的解离程度大于使用1 g UC的情况下的解离程度，这可能表明NH3的解离程度受UC起始原料量的影响很大。 。发现在给定温度下，由具有较低α值的NH3，N-2和H-2组成的气相会生成具有较高N / U比的U2N3 + x。这些实验结果与我们的热力学分析一致。 （C）1998 Elsevier Science S.A. [参考：9]

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