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首页> 外文会议>Symposium on Quasicrystals held November 30-December 2,1998,Boston,Massachusetts,U.S.A. >Measurements of the hydrogen absorption pressure composition isotherms in Ti/Zr-based quasicrystals
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Measurements of the hydrogen absorption pressure composition isotherms in Ti/Zr-based quasicrystals

机译：Ti / Zr基准晶体中氢吸收压力组成等温线的测量

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摘要

The first hydrogen abosrption pressure-composition isotherms (p-c-T were measrued in quasicrystalline ti_45Zr_38Ni_17.No evidence for a pressure plateau was found,indicating a distribution of energies for the hydrogent in interstitial sites.Fits to the p-c-T data confirmed this,givifng energy peaks at -0.19 eV with a full width at half maximum (half-width) of 0.06 eV,and at -0.09 eV with a half-width of 0.08 ev .This is in ocntrast with the broad site energy distribution that is characteristic of a metallic glass.In agreement,fits to data taken from amorphous Ti_45Zr_27Ni_20Si_8 gave a single broad energy distribution at -0.10 ev with a half-width of 0.35 eV.Based on the weighted averages of the site energies for the pure components,the energies assigned to the tetratedral sites in the Ti_44Zr_40Ni_16 1/1 approximant phase are in qualitative agreement with the measured data for the quasicrystal,supporting a local structural similarity between these two phases.Almost all of the absorbed hydrogen can be ddesorbed at 650 deg C in one hour by pumping,without transforming the quasicrystal phase and without powdering the rapidly-quenched samples.
机译：最初的氢吸收压力-等温线（pcT在准晶体ti_45Zr_38Ni_17中进行了测量。没有发现压力平台的证据，表明间隙位置中氢的能量分布。对pcT的拟合证实了这一点，在- 0.19 eV的半高全宽为0.06 eV，-0.09 eV的半高全宽为0.08 ev。这与金属玻璃的宽位能量分布相反。一致地，对从无定形Ti_45Zr_27Ni_20Si_8提取的数据的拟合给出了-0.10 ev处的单个宽能量分布，其半宽度为0.35 eV。基于纯组分的位点能量的加权平均值，分配给四面体位点的能量Ti_44Zr_40Ni_16 1/1近似相中的定性与准晶体的测量数据定性一致，支持了这两个相之间的局部结构相似性。抽气可以在一小时内将氢气在650摄氏度下解吸，而无需转变准晶体相，也无需将快速淬灭的样品粉末化。

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