Neutron Diffraction Study of Nickel in the Liquid State

Abstract

The structure of nickel in the liquid state has been studied by neutron diffraction a t 1500 "C. After calculating the interference function (Fourier analysis), the atomic radial distribution function was evaluated from which interatomic distance and coordination number were obtained.Die Struktur von Nickel im fliissigen Zustand wurde mit Neutronenstrahlen bei 1500 "C untersucht. Nach der schon ofter dargestellten Methode (Fourier-Analyse) wurde die Interferenzfunkt>ion in eine radiale Atomverteilungsfunktion transformiert, aus der sich der mittlere Abstand nachster Atome und die Koordinationszahl ergeben.

Structural study of an amorphous Pd80–Si20 alloy by X-Ray fourier analysis

“…Function G(r) in the region below the first peak maximum of pair distribution function for Pd,,-Xi,, alloy in the amorphous and liquid states neighbour atoms n,. The estimation of the coordination number was fully discussed in a previous paper [19]. As we have no unique method of evaluating this quantity, only a value obtained by the following equation is given in Table 1.…”

Temperature Dependence of the Structure of Liquid Mercury

“…At values of K less than 1.50 A-l, the observed intensity curve was extrapolated to the value K = 0 with reference to the a(0) value which was connected with the coherent small-angle scattering due to the isothermal compressibility. The uncertainty in this extrapolation is insignificant, since the contribution to the radial distribution function from the region of small K is small [8]. I n practice we performed the determination of the intensity pattern with reference to the data measured with CuKa radiation [4].…”

“…The distribution of atoms as a function of the radial distance r for a given reference atom, i.e., 4nrZp0g(r), can be obtained from X-ray coherent scattering intensity I(K), scattered by N atoms with atomic scattering factor f as a function of K , by means of the well-known relations [8] 4nr2pog(5-) = 4 n r z p o + -K(a(K)-11) s i n ( K r ) d K (1) err n 0 and where po is the average density of atoms, g(r) is the pair correlation function, a(K) is the structure factor, K = 4 n sin 811 where 2 8 is the angle between the incident and diffracted X-rays and 1 is the wavelength.…”