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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >High-pressure synthesis of novel hydrides Mg_(7_x)A_xTiH_(16-x) (A = Li, Na, K; x = 0-1.0) and their reversible hydrogen storage properties
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High-pressure synthesis of novel hydrides Mg_(7_x)A_xTiH_(16-x) (A = Li, Na, K; x = 0-1.0) and their reversible hydrogen storage properties

机译：新型氢化物Mg_（7_x）A_xTiH_（16-x）（A = Li，Na，K; x = 0-1.0）的高压合成及其可逆储氢性能

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摘要

Novel quaternary hydrides Mg_(7_x)A_xTiH_(16-x) (A = Li, Na, K) have been synthesized by use of an ultrahigh-pressure (UHP) technique. The Rietveld refinements for synchrotron X-ray diffraction (XRD) patterns suggest that added LiH and NaH greatly enhanced the yield of the Mg_7TiH_(16) phase. The unit cell volumes of the Mg_(7_x)A_xTiH_(16-x) phases were increased with increasing the amount and the ionic radii of the alkali metals. The reversibility of the hydrogen releasing and restoring reactions was much improved by the addition of alkali metal hydrides. The reversible hydrogen storage capacities were around 3-4 wt.% for the Mg_(7_x)A_xTiH_(16-x) phases on the pressure-composition isotherm (PCI) measurements. Obtained enthalpy values tend to be reduced with reducins the AH of the alkali metals.
机译：通过使用超高压（UHP）技术合成了新型季氢化物Mg_（7_x）A_xTiH_（16-x）（A = Li，Na，K）。 Rietveld对同步加速器X射线衍射（XRD）模式的改进表明，添加LiH和NaH可以大大提高Mg_7TiH_（16）相的产率。 Mg_（7_x）A_xTiH_（16-x）相的晶胞体积随着碱金属的含量和离子半径的增加而增加。通过添加碱金属氢化物大大提高了氢释放和还原反应的可逆性。在压力组成等温线（PCI）测量中，Mg_（7_x）A_xTiH_（16-x）相的可逆储氢能力约为3-4 wt。％。还原的碱金属AH值往往会降低获得的焓值。

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