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Isothermal hydrogen absorption process of Pd-capped Mg films traced by ion beam techniques and optical methods

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摘要 Pd-capped nanocrystalline Mg films were prepared by electron beam evaporation and hydrogenated under isothermal conditions to inves-tigate the hydrogen absorption process via ion beam techniques and in situ optical methods.Films were characterized by different techniques such as X-ray diffraction(XRD)and scanning electron microscopy(SEM).Rutherford backscattering spectrometry(RBS)and elastic recoil detection analysis(ERDA)provided a detailed compositional depth profile of the films during hydrogenation.Gas-solid reaction kinetics theory applied to ERDA data revealed a H absorption mechanism controlled by H diffusion.This rate-limiting step was also confirmed by XRD measurements.The diffusion coefficient(D)was also determined via RBS and ERDA,with a value of(1.1±0.1)·10^(−13)cm^(2)/s at 140℃.Results confirm the validity of IBA to monitor the hydrogenation process and to extract the control mechanism of the process.The H kinetic information given by optical methods is strongly influenced by the optical absorption of the magnesium layer,revealing that thinner films are needed to extract further and reliable information from that technique.
出处 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第9期3675-3684,共10页 镁合金学报(英文)
基金 support by Spanish MICINN through the project PID2021-126098OB-I00/AEI/FEDER10.13039/501100011033 are gratefully ac-knowledged the MiNa Laboratory at IMN,and funding from CAM(project S2018/NMT-4291 TEC2SPACE),MINECO(project CSIC13-4E-1794)and EU(FEDER,FSE) fund-ing from TechnoFusion Project(P2018/EMT-4437)of the CAM(Comunidad Autónoma Madrid) support from the Center for Micro-Analysis of Materials(CMAM)-Univer-sidad Autónoma de Madrid,for the beam time proposals,with codes STD005/23,STD020/23 and STD037/23,and its technical staff for their contribution to the operation of the accelerator support from the research project“Captación de Talento UAM”Ref:#541D300 supervised by the Vice-Chancellor of Research of Universidad Autonoma de Madrid(UAM).
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