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The Heat of Formation of the Uranyl Dication: Theoretical Evaluation Based on Relativistic Density Functional Calculations

机译:铀酰阳离子的形成热:基于相对论密度泛函计算的理论评估

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By using a set of model reactions,we estimated the heat of formation of gaseous UO_2~(2+) from quantum-chemical reaction enthalpies and experimental heats of formation of reference species.For this purpose,we performed relativistic density functional calculations for the molecules UO_2~(2+),UO_2,UF_6,and UF_5.We used two gradient-corrected exchange-correlation func-tionals (revised Perdew-Burke-Ernzer-hof (PBEN) and Becke-Perdew (BP)) and we accounted for spin-orbit interaction in a self-consistent fashion.Indeed,spin-orbit interaction notably affects the energies of the model reactions,especially if compounds of U~(IV) are involved.Our resulting theoretical estimates for DELTA_fH_0~0(UO_2~(2+)),365+-10 kcalmol~(-1) (PBEN) and 370 +-12 kcal mol~(-1) (BP),are in quantitative agreement with a recent experimental result,364 +- 15 kcal mol~(-1).Agreement between the results of the two different exchange-correlation functionals PBEN and BP supports the reliability of our approach.The procedure applied offers a general means to derive unknown enthalpies of formation of actinide species based on the available well-established data for other compounds of the element in question.
机译:通过一组模型反应,我们从量子化学反应焓和参考物种形成的实验热估计了气态UO_2〜(2+)的形成热。为此,我们对分子进行了相对论密度泛函计算UO_2〜(2 +),UO_2,UF_6和UF_5。我们使用了两种梯度校正的交换相关函数(修订的Perdew-Burke-Ernzer-hof(PBEN)和Becke-Perdew(BP))实际上,自旋轨道相互作用显着影响模型反应的能量,特别是如果涉及U〜(IV)的化合物。我们对DELTA_fH_0〜0(UO_2〜( 2 +)),365 + -10 kcalmol〜(-1)(PBEN)和370 + -12 kcal mol〜(-1)(BP),与最近的实验结果364 +-15 kcal mol 〜(-1)。两个不同的交换相关函数PBEN和BP的结果之间的一致性支持了我们方法的可靠性。应用的方法提供了一种通用的方法,可以根据有关元素的其他化合物的现有公认数据,得出data系元素物种形成的未知焓。

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