Melting temperature, adiabats, and Grueneisen parameter of lithium, sodium, and potassium versus pressure
Technical Report
·
OSTI ID:6018289
The pressure dependence of the melting temperatures of Li, Na, and K were measured to 32 kbar with accuracies in pressure and temperature of +- 0.4 percent and +- 0.25/sup 0/C, respectively. The measurements were made in a piston cylinder apparatus with a fluid pressure medium. The adiabatic pressure derivatives of temperature, (par. delta T/par. delta P)/sub s/, were measured to 32 kbar and 400/sup 0/C by a pressure pulse method. The logarithm of (par. delta T/par. delta P)/sub s/ decreases linearly with volume. The changes of (par. delta T/par. delta P)/sub s/ at the liquid-solid transitions fall within the data scatter. The Grueneisen parameter was calculated from ..gamma.. = B/sub s//T (par. delta T/par. delta P)/sub s/, where B/sub s/ is the adiabatic bulk modulus. For all three alkali metals, ..gamma.. decreases with compression in both the solid and the liquid states, and at constant volume, ..gamma.. decreases with temperature.
- Research Organization:
- California Univ., Los Angeles (USA). Inst. of Geophysics and Planetary Physics
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6018289
- Report Number(s):
- UCRL-15531; ON: DE83012938
- Country of Publication:
- United States
- Language:
- English
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