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Specific heat of nickel hydride from 10° to 200°K

1971; Elsevier BV; Volume: 32; Issue: 7 Linguagem: Inglês

10.1016/s0022-3697(71)80058-6

1879-2553

G. Wolf, B. Baranowski,

Hydrogen Storage and Materials

The heat capacity of NiHx (x=0·68; 0·59; 0·50) has been measured in the temperature range 10–200°K and extrapolated up to 300°K. The γ-coefficients of the electronic specific heat and Debye temperatures have been evaluated from the results for the 10–20°K region. The values of the standard entropy and the thermal part of the enthalpy have been calculated. The standard entropy of formation of nickel hydride is evaluated and compared with the previous result obtained from the measured free energy and enthalpy of formation. The results for the γ-coefficients do not confirm the rigid band model and seem to follow a simple minimum polarity model.