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Diffusion slowdown in the nanostructured liquid Ga‐Sn alloy
Author(s) -
Podorozhkin Dmitri Y.,
Charnaya Elena V.,
Lee Min Kai,
Chang LiehJeng,
Haase Juergen,
Michel Dieter,
Kumzerov Yurii A.,
Fokin Alexsandr V.
Publication year - 2015
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201400174
Subject(s) - alloy , materials science , gallium , slowdown , diffusion , quadrupole , relaxation (psychology) , chemical physics , analytical chemistry (journal) , condensed matter physics , nuclear magnetic resonance , metallurgy , thermodynamics , atomic physics , chemistry , psychology , social psychology , physics , chromatography , political science , law
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, 71 Ga and 69 Ga, 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.