FROM MACROSCOPIC TO ATOMIC MOTIONS IN LIQUID-METALS

被引:11
作者
LARSSON, KE
DZUGUTOV, M
GUDOWSKI, W
机构
[1] Royal Institute of Technology, Stockholm
来源
NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA D-CONDENSED MATTER ATOMIC MOLECULAR AND CHEMICAL PHYSICS FLUIDS PLASMAS BIOPHYSICS | 1990年 / 12卷 / 4-5期
关键词
Classical; semiclassical; and quantum theories of liquid structure; Kinetic and transport theory; Studies of specific liquid structures;
D O I
10.1007/BF02453311
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
In the present review of liquid dynamics studies on liquid metals are reported. Particularly the case of liquid lead is reviewed because this case was carefully studied by neutron scattering technique, S(Q,ω) being determined at two widely different temperatures T=623 K and T=1170 K and therefore different densities. In addition extensive supplementary MD simulations were made using a 16 384-particle system. The simulations ranged from a determination of an effective pair potential for lead to simulation of the density correlation functions F(Q, t) and F s(Q, t), as well as the longitudinal and transversal current correlation functions J 1(Q, t) and J T(Q, t). The MD simulation «calibrated» via the experimental S(Q) and S(Q,ω) was used to prolong the range of neutron data to draw conclusions regarding such quantities as dispersion relations for the current correlations J 1(Q, t) and J T(Q, t), the generalized viscosity functions ν1(Q, t), ν1(Q) and νs(Q). Information regarding bulk viscosity νB(Q) is also gained. Conclusions are drawn regarding the relative importance of the derived pair potential form by comparison to corresponding hard-sphere data. The general framework of linearized hydrodynamic equations for the macroscopic situation transforming to visco-elastic equations of motion for finite wave-length and high frequency works well also for the case of a continuous potential. The region of transition from simple visco-elastic to hydrodynamic behaviour is occurring at wavelengths in the range (12÷20) Å for the cases studied. The spatial properties of the viscosity functions ν1(r), νs(r) and νB(r) are found to correlate well with the range of the radial distribution function for the liquid. The general results for liquid lead probably have wide range of applicability to other simple liquids with similar S(Q) and g(r) properties. © 1990 Società Italiana di Fisica.
引用
收藏
页码:559 / 586
页数:28
相关论文
共 32 条
[1]   GENERALIZED HYDRODYNAMICS AND ANALYSIS OF CURRENT CORRELATION FUNCTIONS [J].
AILAWADI, NK ;
RAHMAN, A ;
ZWANZIG, R .
PHYSICAL REVIEW A, 1971, 4 (04) :1616-&
[2]   GENERALIZED TRANSPORT-COEFFICIENTS FOR HARD-SPHERES [J].
ALLEY, WE ;
ALDER, BJ .
PHYSICAL REVIEW A, 1983, 27 (06) :3158-3173
[3]  
Boon J-P., 1980, MOL HYDRODYNAMICS
[4]   TIME-DEPENDENT PAIR CORRELATIONS IN LIQUID LEAD [J].
BROCKHOUSE, BN ;
POPE, NK .
PHYSICAL REVIEW LETTERS, 1959, 3 (06) :259-262
[5]   DENSITY FLUCTUATIONS IN LIQUID RUBIDIUM .1. NEUTRON-SCATTERING MEASUREMENTS [J].
COPLEY, JRD ;
ROWE, JM .
PHYSICAL REVIEW A, 1974, 9 (04) :1656-1666
[6]  
DAHLBORG U, 1989, COLLECTIVE EXCITATIO
[7]  
DAHLBORG U, 1989, IN PRESS J PHYS F
[8]  
DAHLBORG U, UNPUB PHYS REV
[9]  
DAHLBORG U, 1982, PHYS REV A, V24, P2712
[10]  
DAHLBORG U, 1966, ARK PHYS, V33, P271