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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Thermochemistry of Gaseous Species in the Dy-Br and Dy-I Systems
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Thermochemistry of Gaseous Species in the Dy-Br and Dy-I Systems

机译：Dy-Br和Dy-I系统中气态物质的热化学

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摘要

The gaseous monohalide, dihalide, and trihalide species in the Dy-Br and Dy-I systems were generated by the reactions of Br_2(g) and I2(g) with Dy(s) in a heated effusion cell reactor, and equilibria among these species were studied in the range of 1300-1500 K by means of mass spectrometric monitoring. Reaction enthalpies were evaluated from third-law analysis of the equilibrium data and were used to derive the individual bond dissociation energies (BDE) in the species and related thermochemical properties. The analysis yielded the selected BDE values at 298 K: D(Dy-Br) = 81.1 ± 2.5, D(BrDy-Br) = 96.1 ± 3.2, and D(Br_2Dy-Br) = 106.0 ± 3.8 kcal mol~(-1); and D(Dy-I) = 64.3 ± 2, D(IDy-I) = 80.1 ± 2.8, and D(I_2Dy-I) = 82.8 ± 3.5 kcal mol-1. Bond energy sums in the two trihalides are in reasonable agreement with atomization enthalpies derived from sublimation data. D°_0 values of DyBr and DyI are compared with recent estimates based on ligand field theory.
机译：Dy-Br和Dy-I系统中的气态一卤化物，二卤化物和三卤化物是由Br_2（g）和I2（g）与Dy（s）在加热的渗出池反应器中反应生成的，且其中的平衡点通过质谱监测在1300-1500 K范围内对这些物种进行了研究。通过对平衡数据的三次定律分析来评估反应焓，并将其用于得出物种中的单个键解离能（BDE）和相关的热化学性质。分析得出选定的BDE值为298 K：D（Dy-Br）= 81.1±2.5，D（BrDy-Br）= 96.1±3.2，D（Br_2Dy-Br）= 106.0±3.8 kcal mol〜（-1） ）;和D（Dy-I）= 64.3±2，D（IDy-I）= 80.1±2.8和D（I_2Dy-I）= 82.8±3.5 kcal mol-1。两个三卤化物中的键能总和与从升华数据得出的雾化焓合理地一致。 DyBr和DyI的D°_0值与基于配体场论的最新估计值进行了比较。

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