Deep insight of unique phase transition behaviors and mechanism in Zr2Co-H isotope system with ultra-low equilibrium pressure AITranslate
Abstract AITranslate
Efficient capture,safe storage and release of tritium from the international thermonuclear experimental reactor(ITER) reaction exhaust gas is a perplexing problem,and the development of an efficient tritium-getter material with ultra-low hydrogenation equilibrium pressure is considered as a reliable way.In this work,Zr2Co alloy was selected as a tritium-getter material and prepared through induction levitation melting.Fundamental performance test results show that Zr2Co exhibits an ultra-low hydrogenation equilibrium pressure of 3.22 × 10-6 Pa at 25℃ and excellent hydriding kinetics under a low hydrogen pressure of 0.005 MPa.Interestingly,unique phase transition behaviors were presented in Zr2Co-H system.Specifically,Zr2CoH5 formed by Zr2Co hydrogenated at room temperature is initially decomposed into ZrH2 and ZrCoH3 at200 ℃.With the temperature increasing to 350 ℃,ZrCoH3is dehydrogenated to ZrCo,and then ZrCo further reacts with ZrH2 at 650 ℃ to reform Zr2Co and hydrogen.Among the staged phase transition pathways during dehydrogenation,the decomposition of Zr2CoH5 occurs preferentially,which is well accordance with both the smallest reaction energy barrier and the maximum reaction spontaneity that are determined respectively from kinetics activation energy and thermodynamics Gibbs free energy.Furthermore,first principles calculation results indicate that the stronger binding of hydrogen in interstitial environments of ZrCoH3and ZrH2 triggers the hydrogen-stabilized phase transformation of Zr2CoH5.The unique phase transition mechanisms in Zr2Co-H system can shed light on the further exploration and regulation of analogous staged phase transition of hydrogen storage materials.
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Basic Information:
DOI:
Chinese Library Classification Number:TB34[一般工业技术—材料科学与工程]
Citation Information:
Efficient capture,safe storage and release of tritium from the international thermonuclear experimental reactor(ITER) reaction exhaust gas is a perplexing problem,and the development of an efficient tritium-getter material with ultra-low hydrogenation equilibrium pressure is considered as a reliable way.In this work,Zr2Co alloy was selected as a tritium-getter material and prepared through induction levitation melting.Fundamental performance test results show that Zr2Co exhibits an ultra-low hydrogenation equilibrium pressure of 3.22 × 10-6 Pa at 25℃ and excellent hydriding kinetics under a low hydrogen pressure of 0.005 MPa.Interestingly,unique phase transition behaviors were presented in Zr2Co-H system.Specifically,Zr2CoH5 formed by Zr2Co hydrogenated at room temperature is initially decomposed into ZrH2 and ZrCoH3 at200 ℃.With the temperature increasing to 350 ℃,ZrCoH3is dehydrogenated to ZrCo,and then ZrCo further reacts with ZrH2 at 650 ℃ to reform Zr2Co and hydrogen.Among the staged phase transition pathways during dehydrogenation,the decomposition of Zr2CoH5 occurs preferentially,which is well accordance with both the smallest reaction energy barrier and the maximum reaction spontaneity that are determined respectively from kinetics activation energy and thermodynamics Gibbs free energy.Furthermore,first principles calculation results indicate that the stronger binding of hydrogen in interstitial environments of ZrCoH3and ZrH2 triggers the hydrogen-stabilized phase transformation of Zr2CoH5.The unique phase transition mechanisms in Zr2Co-H system can shed light on the further exploration and regulation of analogous staged phase transition of hydrogen storage materials.
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| GB/T 7714-2015 | [1] Yang Liu, Pan-Pan Zhou, Xue-Zhang Xiao, et al. Rare Metals, 2024(1): 212-224. |
| MLA | [1] Yang Liu, et al., Rare Metals, no. 1, 2024, pp. 212-224. |
| APA | [1] Yang Liu, Pan-Pan Zhou, Xue-Zhang Xiao, Jia-Cheng Qi, Jia-Peng Bi, Tiao Ying, Xing-Wen Feng, Yan Shi, Wen-Hua Luo, & Li-Xin Chen. (2024). Rare Metals(1), 212-224. |
| IEEE | [1] Yang Liu, Pan-Pan Zhou, Xue-Zhang Xiao, Jia-Cheng Qi, Jia-Peng Bi, Tiao Ying, Xing-Wen Feng, Yan Shi, Wen-Hua Luo, and Li-Xin Chen, Rare Metals, no. 1, pp. 212-224, 2024. |
