The fate of boron and calcium in the destabilized reactive hydride composite Ca(BH4)2-Mg2NiH4

The Ca(BH4)2-Mg2NiH4 composite system is the first reported that has an effective boron transfer between the compounds in the mixture, which makes it ideally suited for a reversible hydrogen storage system.Using the Kalpha/Kbeta ratio from muonic X-rays emitted by boron, that is sensitive to the local environment, we would like to identify which phases are present in the system upon desorption of hydrogen and when H2-absorption triggers the return of boron in the native Ca(BH4)2 framework.To obtain this achievement, we will use high-resolution measurements of X-ray emission from boron and such results are expected to have a pioneering nature in making Muonic X-ray technique a local probe comparable to X-ray emission spectroscopy.

Ca(BH₄)₂-Mg₂NiH₄复合体系是首个被报道的可在混合组分间实现有效硼转移的体系，使其完美适配可逆储氢系统。利用硼元素发射的μ子X射线（muonic X-rays）的Kα/Kβ比值——该比值对材料局域环境具有高度敏感性——我们旨在鉴定该体系在脱氢阶段以及氢吸回触发硼元素回归原生Ca(BH₄)₂骨架时所存在的物相。为实现这一研究目标，我们将采用硼元素的高分辨率X射线发射测量方法；预期该研究成果将使μ子X射线技术成为可与X射线发射光谱法（X-ray emission spectroscopy）相媲美的局域探针，具有开创性意义。