Measurements of metallic shifts and relaxations in liquid metals and alloys

Quitmann, D.

doi:10.1007/bf02397704

Cited by 3 publications

(4 citation statements)

References 92 publications

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“…The magnetic contributions to relaxation of both isotopes proved to be quite similar in pure gallium and alloy, while the quadrupole contribution was enhanced in alloy. The enhancement of quadrupole coupling of the same order was also observed experimentally in Ga-In alloys of various compositions [17,18]. Within the extreme narrowing limit, the quadrupole relaxation rate T −1 1qb is proportional to the correlation time of atomic mobility in bulk alloy τ b [13,19,22]:…”

Section: Discussionsupporting

confidence: 64%

“…The magnetic and quadrupole contributions to relaxation were clearly separated for metals which have more than one isotope since the quadrupole and magnetic relaxation rates are proportional to the squared nuclear quadrupole moment Q and gyromagnetic ratio γ , respectively [14]. In liquid metallic alloys the quadrupole contribution was found to increase compared to pure melts ( [17,18] and references therein). It was suggested that the quadrupole relaxation acceleration in alloys was caused by rearrangement of atoms which led to the increase of electric gradients at nuclear sites [18].…”

Section: Discussionmentioning

confidence: 97%

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Atomic mobility in nanostructured liquid Ga–In alloy

Charnaya

Tien

Lee

et al. 2010

J. Phys.: Condens. Matter

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Nuclear spin relaxation and the Knight shift for (71)Ga, (69)Ga, and (115)In isotopes were studied by nuclear magnetic resonance (NMR) in liquid gallium-indium alloy confined to porous glass and alloy surface film and were compared with the bulk counterparts. Drastic spin relaxation acceleration under nanoconfinement was observed for the three isotopes. Quadrupole and magnetic contributions to spin relaxation were separated for gallium and indium isotopes using the experimental data obtained, which allowed, in particular, the evaluation of correlation times of atomic mobility. The strong decrease in the correlation time was found for confined alloy which evidenced a remarkable diffusion slowdown. The effect of changes in atomic mobility on NMR line broadening was also discussed.

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Section: Discussionsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 97%

Atomic mobility in nanostructured liquid Ga–In alloy

Charnaya

Tien

Lee

et al. 2010

J. Phys.: Condens. Matter

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“…The quadrupole coefficient C 69 for bulk liquid Ga‐Sn alloy is noticeably larger than that in pure liquid gallium which was found to equal about 30·10 12 s −2 in . This result agrees with an increase in quadrupole contribution to nuclear relaxation in several other liquid metallic alloys compared to pure constituents which was found previously experimentally and confirmed theoretically . The quadrupole relaxation acceleration in liquid alloys was suggested to be caused by rearrangement of atoms which led to the increase of electric gradients at nuclear site.…”

Section: Discussionsupporting

confidence: 84%

Diffusion slowdown in the nanostructured liquid Ga‐Sn alloy

Podorozhkin

Charnaya

Lee³

et al. 2015

Annalen der Physik

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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.

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“…An extremely useful collection of the existing material has been presented in 1976 by Carter et a1 [l]. An update of references to later work will appear [2]. General references to NMR and related techniques are [3] and [4].…”

Section: Introductionmentioning

confidence: 99%

Nuclear magnetic resonance studies of liquid metal alloys

Quitmann¹

1990

J. Phys.: Condens. Matter

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The Knight shift K and quadrupolar relaxation rate R, in liquid metallic systems, in which effectsof bonding become increasingly prominent, are surveyed. In Rb, a theoretical calculation of R,, including mode-coupling theory for the liquid, and the r-dependent Sternheimer factor. predicted closely the recent experimental redetermination. In Ge, and in Cu-Ge and similar nearly free-electron systems, the quantitative analysis of K still poses problems, while qualitatively K ( x ) displays clearly a correspondence to the resistivity maximum. In metallic alloys with compound forming tendency, models based on an association (A + B Z AB) connect K and R, quantitatively with the heat of mixing, but the microscopic foundation of the association ansatz is uncertain.

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Measurements of metallic shifts and relaxations in liquid metals and alloys

Cited by 3 publications

References 92 publications

Atomic mobility in nanostructured liquid Ga–In alloy

Atomic mobility in nanostructured liquid Ga–In alloy

Diffusion slowdown in the nanostructured liquid Ga‐Sn alloy

Nuclear magnetic resonance studies of liquid metal alloys

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