High frequency collective dynamics in liquid potassium

A. Monaco; T. Scopigno; P. Benassi; A. Giugni; G. Monaco; M. Nardone; G. Ruocco; M. Sampoli

doi:10.1016/j.jnoncrysol.2007.05.049

High frequency collective dynamics in liquid potassium

A. Monaco^*, T. Scopigno, P. Benassi, A. Giugni, G. Monaco, M. Nardone, G. Ruocco, M. Sampoli

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

We investigated by inelastic X-ray scattering the dynamical properties of molten potassium in a wide range of momentum transfer, Q, from 1 nm^-1 up to the main peak of the structure factor Q ≈ 17 nm^-1. The observed increase of sound velocity in the low Q region (1 < Q < 3 nm^-1), has been described within a model characterized by two distinct relaxation processes for the collective dynamics. The obtained results are discussed and compared with those from previous neutron scattering experiments. In particular, we associate the speed-up of the sound velocity to the 'instantaneous' disorder of the liquid as opposed to the argument, supported by some neutron scattering studies, of a transition from a liquid to solid like response of the system.

Original language	English (US)
Pages (from-to)	3154-3159
Number of pages	6
Journal	Journal of Non-Crystalline Solids
Volume	353
Issue number	32-40
DOIs	https://doi.org/10.1016/j.jnoncrysol.2007.05.049
State	Published - Oct 15 2007
Externally published	Yes

Keywords

Acoustic properties and phonons
Diffraction and scattering measurements
Liquid alloys and liquid metals
Modeling and simulation
Structure
X-rays

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Materials Chemistry

Access to Document

10.1016/j.jnoncrysol.2007.05.049

Cite this

@article{eca88e321b7a48c2b333b7c83934a60d,

title = "High frequency collective dynamics in liquid potassium",

abstract = "We investigated by inelastic X-ray scattering the dynamical properties of molten potassium in a wide range of momentum transfer, Q, from 1 nm-1 up to the main peak of the structure factor Q ≈ 17 nm-1. The observed increase of sound velocity in the low Q region (1 < Q < 3 nm-1), has been described within a model characterized by two distinct relaxation processes for the collective dynamics. The obtained results are discussed and compared with those from previous neutron scattering experiments. In particular, we associate the speed-up of the sound velocity to the 'instantaneous' disorder of the liquid as opposed to the argument, supported by some neutron scattering studies, of a transition from a liquid to solid like response of the system.",

keywords = "Acoustic properties and phonons, Diffraction and scattering measurements, Liquid alloys and liquid metals, Modeling and simulation, Structure, X-rays",

author = "A. Monaco and T. Scopigno and P. Benassi and A. Giugni and G. Monaco and M. Nardone and G. Ruocco and M. Sampoli",

year = "2007",

month = oct,

day = "15",

doi = "10.1016/j.jnoncrysol.2007.05.049",

language = "English (US)",

volume = "353",

pages = "3154--3159",

journal = "Journal of Non-Crystalline Solids",

issn = "0022-3093",

publisher = "Elsevier B.V.",

number = "32-40",

}

TY - JOUR

T1 - High frequency collective dynamics in liquid potassium

AU - Monaco, A.

AU - Scopigno, T.

AU - Benassi, P.

AU - Giugni, A.

AU - Monaco, G.

AU - Nardone, M.

AU - Ruocco, G.

AU - Sampoli, M.

PY - 2007/10/15

Y1 - 2007/10/15

N2 - We investigated by inelastic X-ray scattering the dynamical properties of molten potassium in a wide range of momentum transfer, Q, from 1 nm-1 up to the main peak of the structure factor Q ≈ 17 nm-1. The observed increase of sound velocity in the low Q region (1 < Q < 3 nm-1), has been described within a model characterized by two distinct relaxation processes for the collective dynamics. The obtained results are discussed and compared with those from previous neutron scattering experiments. In particular, we associate the speed-up of the sound velocity to the 'instantaneous' disorder of the liquid as opposed to the argument, supported by some neutron scattering studies, of a transition from a liquid to solid like response of the system.

AB - We investigated by inelastic X-ray scattering the dynamical properties of molten potassium in a wide range of momentum transfer, Q, from 1 nm-1 up to the main peak of the structure factor Q ≈ 17 nm-1. The observed increase of sound velocity in the low Q region (1 < Q < 3 nm-1), has been described within a model characterized by two distinct relaxation processes for the collective dynamics. The obtained results are discussed and compared with those from previous neutron scattering experiments. In particular, we associate the speed-up of the sound velocity to the 'instantaneous' disorder of the liquid as opposed to the argument, supported by some neutron scattering studies, of a transition from a liquid to solid like response of the system.

KW - Acoustic properties and phonons

KW - Diffraction and scattering measurements

KW - Liquid alloys and liquid metals

KW - Modeling and simulation

KW - Structure

KW - X-rays

UR - http://www.scopus.com/inward/record.url?scp=34548573106&partnerID=8YFLogxK

U2 - 10.1016/j.jnoncrysol.2007.05.049

DO - 10.1016/j.jnoncrysol.2007.05.049

M3 - Article

AN - SCOPUS:34548573106

SN - 0022-3093

VL - 353

SP - 3154

EP - 3159

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

IS - 32-40

ER -

High frequency collective dynamics in liquid potassium

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this