Ultrasonic study of hydrogen motion in a Ti-Zr-Ni icosahedral quasicrystal and a 1/1 bcc crystal approximant
Ultrasonic study of hydrogen motion in a Ti-Zr-Ni icosahedral quasicrystal and a 1/1 bcc crystal approximant
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Ti-Zr-Ni 二十面体准晶体和 1/1 bcc 晶体近似中氢运动的超声研究
DOI：
10.1103/physrevb.61.241
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
K. Kelton
中科院分区：
文献类型：
--
作者：
K. Foster;R. G. Leisure;J. Shaklee;Jaeyong Kim;K. Kelton
在35 ~ 335 K的温度范围内对Ti-Zr-Ni合金体系进行了超声衰减测量。研究了多晶二十面体准晶和1/1 bcc多晶近似晶。经氢化处理，合金的二十面体相氢金属比为0.79，晶相氢金属比为0.20。在加载氢的合金中观察到与温度相关的衰减峰，而无氢材料则没有异常特征。对于1 MHz附近的测量频率，衰减最大值发生在250 K的结晶相和220 K的二十面体相附近。结果表明，在二十面体相中氢原子的运动比在近似相中快一个数量级。这一结果是由于两个Ti-Zr-Ni相之间的内在差异还是由于对氢浓度的依赖，从目前的测量无法确定。
Ultrasonic attenuation measurements have been performed on the Ti-Zr-Ni alloy system over the temperature range 35–335 K. Both a multigrained icosahedral quasicrystal and a 1/1 bcc polycrystalline approximant were studied. The alloys were hydrogenated to a hydrogen to metal ratio of 0.79 for the icosahedral phase and 0.20 for the crystalline phase. Temperature-dependent attenuation peaks were observed in the alloys loaded with hydrogen while the hydrogen-free materials showed no unusual features. For measurement frequencies near 1 MHz the attenuation maxima occurred near a temperature of 250 K for the crystalline phase and 220 K for the icosahedral phase. The results imply that the hydrogen motion is about one order of magnitude faster in the icosahedral phase than in the approximant phase. Whether this result is due to an intrinsic difference between the two Ti-Zr-Ni phases or to a dependence on hydrogen concentration cannot be determined from the present measurements.