AN EXPERIMENTAL EQUATION OF STATE FOR SODIUM
An equation was obtained for pressures to 20000 atm and from 20 deg K to the mp. Various experimental details are given of an apparatus with which it is possible to obtain pressure-volume data which are reliable to plus or minus 0.002 in DELTA V/V/sub 0/ over this range of temperature and pressure. The equation of state can be represented to within the above accuracy by an expression which is derived from the assumption that the isothermal compressibility is linear with volume and has no explicit temperature dependence. A discussion is given of the effect of these assumptions on the validity of calculations of the variation with volume of the temperature dependent contribution to the thermodynamic functions. Grueneisen constants as obtained from various definitions are calculated as functions of temperature and volume, and the validity of the Mie-Grueneisen equation of state as ft applies to Na appears open to question below room temperature. Recent high pressure ultrasonic experiments on Na are interpreted as being in agreement with this conclusion. (auth)
- Research Organization:
- Ames Lab., Ames, Iowa
- NSA Number:
- NSA-15-019378
- OSTI ID:
- 4004066
- Journal Information:
- Phys. and Chem. Solids, Journal Name: Phys. and Chem. Solids Vol. Vol: 18
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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