The experimental heat capacity of solid hydrogen as a function of molar volume
Abstract
Constant volume heat capacity measurements were made on six solid hydrogen samples with low orthohydrogen concentrations. The measurements extend from approximately 1.5 K to the melting line, with molar volumes ranging from 22.787 cu cm/mole to 16.193 cu cm/mole. Although clustering of the ortho molecules was observed, the low temperature heat capacity anomaly due to the orthohydrogen pairs could be described quite well by the assumption of a fixed distribution. The data were corrected to obtain a lattice heat capacity which on extrapolation to T=0 yielded Debye temperatures and a volume dependent Gruneisen parameter. A modified Mie-Gruneisen approximation was used to define a volume and temperature dependent Gruneisen parameter which was used to calculate the equation of state, P(V,T), and isothermal bulk modulus, BT(V,T), for the six isochores.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- May 1978
- Bibcode:
- 1978PhDT........93K
- Keywords:
-
- Density (Mass/Volume);
- Hydrogen;
- Solid State;
- Specific Heat;
- Approximation;
- Concentration (Composition);
- Density Distribution;
- Equations Of State;
- Engineering (General)