Ti_(39)Zr_(38)Ni_(17)Pd_6二十面体准晶储氘研究（英文）  

Deuterium Storage of Ti_(39)Zr_(38)Ni_(17)Pd_6 Icosahedral Quasicrystal

作　　者：黄火根[1] 陈亮[1] 杜晓清[2] 李嵘[2] 

机构地区：[1]中国工程物理研究院,四川绵阳621900 [2]表面物理与化学重点实验室,四川绵阳621907

出　　处：《稀有金属材料与工程》2015年第7期1581-1586,共6页Rare Metal Materials and Engineering

基　　金：Foundation of Science and Technology on Surface Physics and Chemistry Laboratory;Science and Technology Development Foundation of China Academy of Engineering Physics(2013B0302046)

摘　　要：Ti-Zr-Ni基二十面体准晶是一类特殊的储氢材料,在氢能和核聚变能领域具有较强应用前景。采用XRD、TEM、XPS技术和气固反应系统研究了Ti39Zr38Ni17Pd6二十面体准晶的储氘性能。该合金室温下的饱和吸氘浓度接近11 mmol·D2/g·M(D2指氘分子,M指金属),超过Zr2Fe和Zr Co 2种合金。在吸放氘循环过程中,没有发现该合金发生相转变。饱和吸氘使得准晶格膨胀了6.37%,并使得Ti与Zr的结合能上升0.2和0.6 e V,反映出氢原子在这种材料中的占位更靠近这2种金属原子。放氘结果显示该合金具有可能较低的坪台压力,350℃左右低于1 k Pa,这意味着氘原子在该合金中比在Zr Co合金中具有更高的稳定性。以上结果表明,这种准晶有可能替代Zr2Fe和Zr Co合金而在核聚变能领域得到应用。Ti-Zr-Ni-based icosahedral quasicrystals（IQCs） are a type of hydrogen storage materials with promising application in the fields of hydrogen energy and nuclear fusion energy.In the present paper, the preparation of Ti39Zr38Ni17Pd6 IQC and its deuterium storage properties were investigated by XRD, TEM, XPS analysis and a gas-solid reaction system.Results show that the saturation concentration of absorbing deuterium for the alloy at room temperature reaches near 11 mmol·D2/g·M（D2 means deuterium molecular and M the metal）, exceeding those of Zr2 Fe and ZrCo alloys.After a few absorption/desorption cycles, no phase transformation is observed, but the quasilattice displays a remarkable expansion of 6.37% after full D intake.The binding energy rise of 0.2 eV for Ti and 0.6 eV for Zr, caused by the introduction of saturated deuterium atoms, provides the evidence of the preferential location of deuterium near Zr and Ti in quasicrystals of this kind.The possible existence of a lower D desorption equilibrium pressure with 1 k Pa at about 350 ℃ reflects higher thermodynamic stability of deuterium in the IQC than in ZrCo alloy.The advantages in hydrogen volume, thermal and structural stabilities suggest that the quasicrystals of this type could be a candidate to replace Zr2 Fe and ZrCo in nuclear fusion field.

关 键 词：准晶 储氢合金 氢同位素 Ti-Zr-Ni-Pd 

分 类 号：TG139.7[一般工业技术—材料科学与工程]