Experimental equations-of-state for cesium and lithium metals to 20 kbar and the high-pressure behavior of the alkali metals

Journal Article · Tue Jan 15 04:00:00 EST 1985 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.31.668· OSTI ID:6070212

Anderson, M S; Swenson, C A

Experimental equation-of-state results to 20 kbar and from 4 K to room temperature are given for cesium and lithium metals which are comparable with those published previously for sodium, potassium, and rubidium (Phys. Rev. B 28, 5395 (1983)). The same generalization holds that the isothermal bulk modulus is a function of the volume only. Cesium and lithium each are slightly more compressible in a reduced sense than the other three alkali metals, and have Grueneisen parameters (1.14 and 0.878, respectively) which are smaller than the common value for the others, 1.25. Extrapolations of the present results for the alkali metals are compared with other data to 100 kbar, with these earlier results scattering about the extrapolation. It is suggested that the bcc-to-fcc transitions in potassium, rubidium, and cesium occur at common values of the ratio of the nearest-neighbor distance to the ionic or pseudopotential radius. No systematic trends are observed in these equation-of-state results which can be associated with an increase in s-d mixing effects with increasing ionic mass.

• Research Organization: Ames Laboratory, U.S. Department of Energy and Department of Physics, Iowa State University, Ames, Iowa 50011
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6070212
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 31:2; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALKALI METALS
CESIUM
COMPARATIVE EVALUATIONS
COMPRESSIBILITY
CRYSTAL-PHASE TRANSFORMATIONS
ELEMENTS
EQUATIONS
EQUATIONS OF STATE
LITHIUM
MECHANICAL PROPERTIES
METALS
PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE
VERY HIGH PRESSURE