Diffusion slowdown in the nanostructured liquid Ga‐Sn alloy

Diffusion slowdown in the nanostructured liquid Ga‐Sn alloy
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纳米结构液态 GaâSn 合金中的扩散减慢

DOI:
10.1002/andp.201400174
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发表时间:
2015
期刊:
影响因子:
2.4
通讯作者:
A. V. Fokin
A. V. Fokin
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
D. Y. Podorozhkin;E. V. Charnaya;M. K. Lee;L.-J. Chang;J. Haase;D. Michel;Y. A. Kumzerov;A. V. Fokin

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通过核磁共振研究了嵌入不同多孔二氧化硅基体中的液态 Ga-Sn 合金中镓的扩散。在两个磁场下测量了两种镓同位素 71 Ga 和 69 Ga 的自旋弛豫。对于纳米结构合金,观察到四极对弛豫的贡献显着增加,随着孔径的减小而增加。对原子迁移率的相关时间进行了评估,发现其远大于相关块体熔体的相关时间,这证明了纳米限制下 Ga-Sn 合金中扩散速度明显减慢。结果表明,合金在 7 nm 孔内的扩散速度减慢了 30 倍。发现最细孔隙的零频率电场梯度谱密度加倍。发现纳米结构合金的奈特位移有所下降,但略有下降。
The diffusion of gallium in liquid Ga‐Sn alloy embedded into different porous silica matrices was studied by NMR. Spin relaxation was measured for two gallium isotopes,71Ga and69Ga, at two magnetic fields. Pronounced rise of quadrupole contribution to relaxation was observed for the nanostructured alloy which increased with decreasing the pore size. The correlation time of atomic mobility was evaluated and found to be much larger than in the relevant bulk melt which evidenced a pronounced diffusion slowdown in the Ga‐Sn alloy under nanoconfinement. It is shown that the diffusion was slower by a factor of 30 for the alloy within 7 nm pores. The spectral densities of electric field gradients at zero frequency were found to double for the finest pores. The Knight shift was found to decrease but slightly for the nanostructured alloy.
金属中的磁共振
DOI: --
发表时间: 1971
期刊:
影响因子: --
作者:
J. Winter
通讯作者: J. Winter
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DOI: --
发表时间: 1990
期刊:
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DOI: 10.1103/physreva.28.2459
发表时间: 1983-01-01
期刊: PHYSICAL REVIEW A
影响因子: 2.9
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BOSSE, J;QUITMANN, D;WETZEL, C
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发表时间: 2005
期刊: Physical Review B
影响因子: 3.7
作者:
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DOI: 10.1063/1.1674167
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影响因子: 4.4
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