Structure of liquid K-Pb alloys

Abstract

The structure factors of liquid Pb, Ko.zsPbo 75r KO 6sPbo 35 and Ko.80Pbo 2o have been measured by means of neutron diffraction. The main peaks of the structure factors of the alloys are preceded by a pre-peak which is most pronounced in Ko,50Pbo This prepeakindicates that there is considerable orderingin the alloys, although there is also evidence for a tendency towards phase separation in at least one of the alloys. From inspection of the radial distribution functions it follows that Pb clusters are formed, the concentrations of which increase when the equi-atomic composition is approached. A simple model of the structure of K,ljoPbo based on the reference interaction site model proves to be in excellent agreement with the measured structure factor.

Fluctuating magnetic moments in liquid metals

“…Presumably, this difference can be attributed to the presence of two interacting systems in a liquid metal: the positively charged ionic liquid and the negatively charged conduction sea. This notion has stimulated the study of the decay mechanism of the density fluctuations, by means of neutron and X-ray scattering experiments, as well as by molecular dynamics (MD) computer simulations in a range of liquid metals, such as Hg [1,2,3,26,27], Cs [4,5,28], K [6,7,8], Rb [9,10], Na [11,12,13,14,29,30], Li [15,16,17,31], Pb [18,19,20,21,32], Al [22,33], and Ga [23].…”

“…During the past decades the properties of a range of elemental liquid metals have been studied by means of neutron scattering [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25] and X-ray scattering experiments [26,27,28,29,30,31,32,33].…”

Thermodynamic properties of dilute solutions of various elements in liquid lead

“…The structural features of liquid potassium alloys with lead were considered in the review [25] and studies [51,52]. A substantial ordering is observed in liquid alloys, being at a maximum at the equiatomic composition.…”

Polarized neutron scattering investigation of excitations at low momentum transfer in liquid Ga: The mystery continues

“…Surprisingly however, it was reported [7] that cage diffusion could be observed directly in neutron scattering experiments at low momentum transfer as a contribution separate from the standard three hydrodynamic modes and extensions thereof to finite q. This separate contribution, directly observable in liquid Hg [7,9] and Ga [3,5] and inferred from scattering data on liquid Pb [14,15], has not been seen in x-ray experiments [6,16,17], nor has it been observed in computer simulations with a strength anywhere near comparable to what has been seen in neutron scattering experiments, as we review in the following. The purpose of this paper is to test whether a new interpretation in terms of shortlived magnetic excitations that appears to provide a way out of this conundrum [9,15] actually works for liquid gallium.…”