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5 Polish Journal of Chemistry

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Thermodynamics and Electrochemistry in Pd-H and Ni-H Systems

Dębowska L., Baranowski B.

Polish Journal of Chemistry

2008

Vol. 82, nr 3

643-646

Relations Between Superconducting Transition Temperatures and Corresponding Hydrogen Activities of Palladium Hydride Samples

Baranowski B., Dębowska L.

Polish Journal of Chemistry

2006

Vol. 80, nr 5

843-846

Limited Penetration Depths of Hydrides in Cylindrical Pd-Ni Alloy Samples

Baranowski B., Dębowska L.

Polish Journal of Chemistry

2005

Vol. 79 / nr 4

783-787

The penetration depths of hydrides formed in 6.8 kbar of gaseous hydrogen in cylindrical samples was investigated at 25°C in Pd-Ni alloys of 80, 120, 150, 200 and 250 mi mdiameters. The exposition time was about 4 months, thus, sufficient for the stationarity in respect to equilibration of the sample composition. In all alloys the penetration depth was limited, exhibiting a linear increase with radii of the wires applied with the slope of about 0.6 mi m per 1 mi m of the wire radius. These results are interpreted in terms of the coherent character of the hydride formation, supporting the thermodynamic reason for the limited penetration depth of metallic hydrides.

The Nature of Phase Transitions in Me-H Systems. Coherent and Incoherent Equilibria

Baranowski B., Dębowska L.

Polish Journal of Chemistry

2003

Vol. 77 / nr 9

1213-1216

Free Energy of Hydride Formation in Pd-Ni Alloys System

Baranowski B., Dębowska L.

Polish Journal of Chemistry

2003

Vol. 77 / nr 9

1207-1212

Formation and decomposition pressures of hydrides for Ni0.3Pd0.7, Ni0.5Pd0.5, Ni0.7Pd0.3 and Ni0.9Pd0.1 alloys have been determined by following the thermoelectric power of these alloys as function of hydrogen pressure at 298 K. From the desorption pressures the free energies of hydride formation were calculated. These results combined with literature data are discussed in terms of deviation from an ideal behavior. The dominance of nickel is clearly demonstrated, what could be expected from its large hydride formation pressure in comparison with palladium hydride. The term "excess free energy of formation" is introduced and discussed for the alloy system treated.