Hostname: page-component-745bb68f8f-l4dxg Total loading time: 0 Render date: 2025-01-27T02:18:03.160Z Has data issue: false hasContentIssue false
  • English
  • Français

Thermodynamic Properties of the Alkali Metals at High Pressures and High Temperatures

Published online by Cambridge University Press:  21 February 2011

Reinhard Boehler
Reinhard Boehler*
Affiliation:
Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90024
Get access

Abstract

The melting temperatures of Li, Na, K, Rb, and Cs versus pressure were measured to 32 kbar in a piston cylinder apparatus with hydrostatic pressure medium and in situ pressure measurements. The accuracies in pressure and temperature are ± 0.4 % and ± 0.25° C, respectively. Substantial deviation from measurements using solid, non-hydrostatic pressure media is observed. The adiabat, (δT/δP)s,was measured to 32 kbar and 400°C by adiabatic compression. Ln (δT/δP)s is a linear function of volume with good consistency in the slopes. (δT/δP)s changes insignificantly at the liquid-solid phase transitions. The Grüneisen parameters, calculated from γ = Bs/T (δT/δP)s, decreases with pressure and temperature. Bs is the adiabatic bulk modulus. The γ-volume curves show strong curvature and γ tends to become volume independent at compressions of about 30 %. γ increases by several percent at the liquid-solid transition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 22: Symposium NY – High Pressure in Science and Technology , 1983 , 21
Copyright
Copyright © Materials Research Society 1984

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Boehler, R., Phys. Rev. B 27, 6754 (1983)CrossRefGoogle Scholar
2. Boehler, R., and Ross, M., in preparationGoogle Scholar
3. Grover, R. (in preparation for Handbook of Thermodynamic and Transport Properties of the Alkali Metals-- IUPAC edited by Ohse, R. W.)Google Scholar
4. Glötzel, D. and McMahan, A. K., Phys. Rev. B 20, 3210 (1979)Google Scholar