Diffusion of Cu in AlCu alloys of different composition by quasielastic neutron scattering
Diffusion of Cu in AlCu alloys of different composition by quasielastic neutron scattering
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准弹性中子散射Cu在不同成分AlCu合金中的扩散
DOI：
10.1016/j.jnoncrysol.2007.05.074
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
D. Sordelet
中科院分区：
文献类型：
--
作者：
U. Dahlborg;M. Besser;M. Calvo;S. Janssen;F. Jurányi;M. Kramer;James R. Morris;D. Sordelet
在瑞士中子源SINQ的FOCUS飞行时间谱仪上，在三种不同温度下对熔融Al 1 − xCu x合金（x=0.10、0.17和0.25）进行了准弹性冷中子散射实验。由于在小Q下散射的主要部分是不相干的，并且来自Cu，因此Cu离子的自扩散系数D可以由准弹性峰的宽度确定。导出的值是相当大的比毛细管测量中发现的。即使D的测定精度好于约4%，也不能断定D的温度变化是否遵循阿耳忒弥斯定律或幂律。
Quasielastic cold neutron scattering experiments on molten Al1−xCuxalloys (x=0.10, 0.17 and 0.25) have been performed at three different temperatures on the FOCUS time-of-flight spectrometer at the Swiss neutron spallation source SINQ. As the main part of the scattering at small Q is incoherent and originating from Cu, self-diffusion coefficients D for the Cu ions could be determined from the widths of quasielastic peaks. The derived values are considerably larger than those found in capillary tube measurements. Even if the accuracy in the determination of D is better than about 4% it could not be concluded whether the temperature variation of D follows an Arrhenius law or a power law.