本文研究了用四氢呋喃(简称THF)改性过的Mg(简称THF-Mg)的吸放氢性能。电子结构,晶体结构及其氢化物的稳定性与微观形貌。THF-Mg经20次吸放氢循环后,在3.5MPa氢压力及643K温度下,吸氢量为3.5wt-％;在1.3Pa真空,643K温度下,放氢量为3.2Wt-％,THF改变了Mg的电子结构,但不改变晶体结构。在吸氢后的产物中,除MgH_2相外,还有新的氢化物相形成。Mg中形成的氢化物是多晶体,晶内广泛存在着的滑移带和孪晶表明,Mg吸氢相变发生较大的畸变。
The hydriding and dehydriding properties, electronic structure, crysta-lline structure and micomorphology of Mg modificd by tetrahydrofuran, as well asthe stabllity of its hydride have been investigated. Experimental results show thatafter 20 cycles of hydriding and dehydriding, the modified Mg may absorb 3.5 wt-%hydrogen at 643 K under 3.5 MPa H_2, and evacuate 3.2 wt-% hydrogen at 642 Kunder vacuum. The tetrahydrofuran may cause the change of electron structure ofMg, but not change the crystalline structure. It was found a new hydride phasebesides MgH_2 in the hydrided products. The distortion in great extent may be result-ed by the hydriding transformation as the polycrystalline hydride formed in Mgand the slip band and twin widely spreaded in the crystals of Mg hydride.
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