Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, Piazzale A. Moro 5, 00185 Rome, Italy.
Dipartimento di Fisica, Sapienza Università di Roma, Piazzale A. Moro 5, 00185 Rome, Italy.
Molecules. 2023 Jan 21;28(3):1082. doi: 10.3390/molecules28031082.
The hydrogen/deuterium sorption properties of NiTiNb synthesized by the vacuum induction melting technique were measured between 400 and 495 °C for pressure lower than 3 bar. The Sieverts law is valid up to H(D)/M < 0.2 in its ideal form; the absolute values of the hydrogenation/deuteration enthalpy are ΔH(H) = 85 ± 5 kJ/mol and ΔH(D) = 84 ± 4 kJ/mol. From the kinetics of absorption, the diffusion coefficient was derived, and an Arrhenius dependence from the temperature was obtained, with E = 12 ± 1 kJ/mol for both hydrogen isotopes. The values of the alloy permeability, obtained by combining the solubility and the diffusion coefficient, were of the order of 10 mol m s Pa, a value which is one order of magnitude lower than that of NiTiNb, until now the best Ni-Ti-Nb alloy for hydrogen purification. In view of the simplicity of the technique here proposed to calculate the permeability, this method could be used for the preliminary screening of new alloys.
通过真空感应熔炼技术合成的 NiTiNb 的氢/氘吸附性能在 400 至 495°C 之间、压力低于 3 巴的条件下进行了测量。在理想形式下，Sieverts 定律在 H(D)/M < 0.2 时有效；氢化/氘化焓的绝对值为 ΔH(H) = 85 ± 5 kJ/mol 和 ΔH(D) = 84 ± 4 kJ/mol。从吸收动力学中，推导出扩散系数，并得出与温度的阿累尼乌斯关系，对于两种氢同位素，E = 12 ± 1 kJ/mol。通过结合溶解度和扩散系数获得的合金渗透率值约为 10 mol m s Pa，这一值比迄今为止用于氢气净化的最佳 NiTiNb-Ni-Ti-Nb 合金低一个数量级。鉴于这里提出的计算渗透率的技术简单，该方法可用于新合金的初步筛选。
