High pressure study of sodium trihydride.

High pressure study of sodium trihydride.
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DOI:
10.3389/fchem.2023.1306495
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发表时间:
2023
影响因子:
5.5
通讯作者:
--
中科院分区:
化学3区
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通过一系列高温实验,结合第一性原理计算,研究了金刚石砧细胞中高达78 GPa压力的钠和氢之间的反应性。粉末x射线衍射测量表明,将过量H2中的钠加热到27gpa以上的2000 K左右,生成三氢化钠(NaH3),其结构为正交结构(空间群Cmcm)。拉曼光谱测量表明,NaH3在NaH晶格内含有准分子氢(),与纯H2相比,拉伸模式下降(Δν ~ - 120 cm−1,50 GPa)。NaH3在室温压缩至至少78 GPa时是稳定的,并表现出显著的P-T稳定性,在低于18 GPa的压力下分解。与以往的实验和理论研究相反,在27 ~ 75 GPa的过量H2中加热NaH(或NaH3)并不会促进进一步加氢形成NaH3以外的多氢化钠。
The reactivity between NaH and H2 has been investigated through a series of high-temperature experiments up to pressures of 78 GPa in diamond anvil cells combined with first principles calculations. Powder X-ray diffraction measurements show that heating NaH in an excess of H2 to temperatures around 2000 K above 27 GPa yields sodium trihydride (NaH3), which adopts an orthorhombic structure (space group Cmcm). Raman spectroscopy measurements indicate that NaH3 hosts quasi-molecular hydrogen () within a NaH lattice, with the stretching mode downshifted compared to pure H2 (Δν ∼−120 cm−1 at 50 GPa). NaH3 is stable under room temperature compression to at least 78 GPa, and exhibits remarkable P-T stability, decomposing at pressures below 18 GPa. Contrary to previous experimental and theoretical studies, heating NaH (or NaH3) in excess H2 between 27 and 75 GPa does not promote further hydrogenation to form sodium polyhydrides other than NaH3.
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