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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >In situ Investigations on the Formation and Decomposition of KSiH3 and CsSiH3
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In situ Investigations on the Formation and Decomposition of KSiH3 and CsSiH3

机译:原位调查KSIH3和CSSIH3的形成和分解

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The system KSi-KSiH3 stores 4.3 wt% of hydrogen and shows a very good reversibility at mild conditions of 0.1 MPa hydrogen pressure and 414 K.([1]) We followed the reaction pathways of the hydrogenation reactions of KSi and its higher homologue CsSi by in situ methods in order to check for possible intermediate hydrides. In situ diffraction at temperatures up to 500 K and gas pressures up to 5.0 MPa hydrogen gas for X-ray and deuterium gas for neutron reveal that both KSi and CsSi react in one step to the hydrides KSiH3 and CsSiH3 and the respective deuterides. Neither do the Zintl phases dissolve hydrogen (deuterium), nor do the hydrides (deuterides) show any signs for non-stoichiometry, i.e. all phases involved in the formation are line phases. Heating to temperatures above 500 K shows that at 5.0 MPa hydrogen pressure only the reaction 2CsSi + 3H(2) = 2CsSiH(3) is reversible. Under these conditions, KSiH3 decomposes to a clathrate and potassium hydride according to 46KSiH(3) = K8Si46 + 38KH + 50H(2).
机译:该系统KSI-KSIH3将4.3wt%的氢气储存,并在0.1MPa氢气压力的温和条件下显示出非常好的可逆性,414 k。([1]),我们遵循KSI的氢化反应的反应途径及其更高的同源性CSSI通过原位方法来检查可能的中间氢化物。在高达500k的温度下,高达500k的温度和用于中子的X射线和氘气的气体的气体衍射显微显示,KSI和CSSI两步反应到氢化物KsiH3和CSSIH3和相应的氘醚。 Zintl相位也不溶解氢气(氘),也不是氢化物(氘代)显示非化学计量的任何迹象,即形成的所有阶段都是线相。加热至500k以上的温度表明,在5.0MPa的氢气压力下,仅反应2CSSI + 3H(2)= 2CSSIH(3)是可逆的。在这些条件下,KSIH3根据46ksiH(3)= K8SI46 + 38KH + 50H(2)分解给乙酸盐和氢化钾。

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