Quasi-elastic neutron scattering from liquid gallium over the temperature range 163 to 333 K

Bosio, L.; Schedler, E.; Windsor, C. G.

doi:10.1051/jphys:01976003706074700

Cited by 11 publications

(4 citation statements)

References 13 publications

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“…The results of our study indicate directly that the socalled de Gennes narrowing phenomenon occurs in liquid gallium mainly due to the local structure features, rather than due to the collective dynamics of atoms (ions). This is fully consistent with the main findings of the recent paper [39], as well as with conclusions given [40] and [41]. In fact, the structure of liquid gallium including the short-range order with the spatial scales typical for the de Gennes narrowing can be reproduced by the soft quasi-spheres model.…”

Section: Microscopic Structure Of Liquid Galliumsupporting

confidence: 93%

Extended short-range order determines the overall structure of liquid gallium

Мокшин

Khusnutdinoff

Galimzyanov

et al. 2020

Phys. Chem. Chem. Phys.

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Polyvalent metal melts (gallium, tin, bismuth, etc.) have microscopic structural features, which are detected by neutron and X-ray diffraction and which are absent in simple liquids. Based on neutron and X-ray diffraction data and results of ab initio molecular dynamics simulations for liquid gallium, we examine the structure of this liquid metal at atomistic level. Time-resolved cluster analysis allows one to reveal that the short-range structural order in liquid gallium is determined by a range of the correlation lengths. This analysis performed over set of independent samples corresponding to equilibrium liquid phase discloses that there are no stable crystalline domains as well as molecule-like Ga2 dimers typical for crystal phases of gallium. Structure of liquid gallium can be reproduced by the simplified model of the close-packed system of soft quasi-spheres. The results can be applied to analyze the fine structure of other polyvalent liquid metals. arXiv:2002.10745v1 [cond-mat.soft]

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Section: Microscopic Structure Of Liquid Galliumsupporting

confidence: 93%

Extended short-range order determines the overall structure of liquid gallium

Мокшин

Khusnutdinoff

Galimzyanov

et al. 2020

Phys. Chem. Chem. Phys.

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“…Both wavevectors show a nearly linear increase in the width of the spectra, deduced from a fit with a single Lorentzian. A linear dependence in the line width between about 400 K and 200 K has previously been reported [43,46]. The width at Q = 2.…”

Section: Resultssupporting

confidence: 56%

“…The slowest structural relaxation dynamics is expected at the structure factor maximum and this slowing down in dynamics at nearest neighbor distances is known as deGennes narrowing [42]. These relaxing slow density fluctuations were measured in gallium in the past several times [43][44][45][46]. The studies focused on the supercooled state of gallium, utilizing the ability to cool gallium 150 K below the melting point with the aim to understand the solidification process.…”

Section: Introductionmentioning

confidence: 99%

Dynamics on next-neighbour distances in liquid and undercooled gallium

Demmel

2018

J. Phys.: Condens. Matter

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Density fluctuations of liquid and 20 K undercooled gallium have been studied by neutron spectroscopy. The decay of density fluctuations has been recorded at the structure factor maximum over a wide temperature range up to twice the melting temperature. The amplitude of the scattering function falls off with rising temperature in a nonlinear way with a changing slope around 1.5 T melting . The derived generalized longitudinal viscosity shows an upturn with decreasing temperature in the same temperature range. This increase in viscosity can be understood that liquid gallium transforms from a more fluid liquid metal to a more viscous liquid metal in that temperature range upon cooling. The change in the amplitude shows a remarkable agreement with results from liquid aluminium, lead and rubidium. This study suggests a universal crossover in dynamics of liquid monatomic metals, despite the many peculiar properties of gallium.

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“…Early inelastic scattering on liquid Ga were performed at the beginning of the seventies with neutrons (Bosio et al, 1976;Gläser et al, 1973;Löffler, 1973;Page et al, 1973). Due to the quite large sound velocity value, compared to the available kinematic range, these studies were mainly addressed to the investigation of the quasielastic part of the dynamic structure factor.…”

Section: Galliummentioning

confidence: 99%

Microscopic dynamics in liquid metals: The experimental point of view

2005

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The experimental results relevant for the understanding of the microscopic dynamics in liquid metals are reviewed, with special regards to the ones achieved in the last two decades. Inelastic Neutron Scattering played a major role since the development of neutron facilities in the sixties. The last ten years, however, saw the development of third generation radiation sources, which opened the possibility of performing Inelastic Scattering with X rays, thus disclosing previously unaccessible energy-momentum regions. The purely coherent response of X rays, moreover, combined with the mixed coherent/incoherent response typical of neutron scattering, provides enormous potentialities to disentangle aspects related to the collectivity of motion from the single particle dynamics. If the last twenty years saw major experimental developments, on the theoretical side fresh ideas came up to the side of the most traditional and established theories. Beside the raw experimental results, therefore, we review models and theoretical approaches for the description of microscopic dynamics over different length-scales, from the hydrodynamic region down to the single particle regime, walking the perilous and sometimes uncharted path of the generalized hydrodynamics extension. Approaches peculiar of conductive systems, based on the ionic plasma theory, are also considered, as well as kinetic and mode coupling theory applied to hard sphere systems, which turn out to mimic with remarkable detail the atomic dynamics of liquid metals. Finally, cutting edges issues and open problems, such as the ultimate origin of the anomalous acoustic dispersion or the relevance of transport properties of a conductive systems in ruling the ionic dynamic structure factor are discussed.

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Quasi-elastic neutron scattering from liquid gallium over the temperature range 163 to 333 K

Cited by 11 publications

References 13 publications

Extended short-range order determines the overall structure of liquid gallium

Extended short-range order determines the overall structure of liquid gallium

Dynamics on next-neighbour distances in liquid and undercooled gallium

Microscopic dynamics in liquid metals: The experimental point of view

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