Pressure-composition isotherms of hydrogen and deuterium in vanadium films measured with a vibrating quartz microbalance
- 1 July 1982
- journal article
- Published by IOP Publishing in Journal of Physics F: Metal Physics
- Vol. 12 (7), 1369-1381
- https://doi.org/10.1088/0305-4608/12/7/009
Abstract
Thin films of vanadium produced by vapour deposition on vibrating quartz crystals were used to determine thermodynamic parameters of hydrogen occlusion from the gas phase in the pressure range 10-10Hx=-26 kJ (mol H)-1, Delta HDx=-28 kJ (mol H)-1 and Delta SH,Dx nc/R=-6. The pressure-composition isotherms indicated various phase transitions in agreement with the known phase diagram. Values of the enthalpies of transition Delta H (in kJ (mol H)-) and the entropies of transition Delta S/R were -35 and -5 for VHx<( alpha )-VH0.5( beta ); -36 and -6 for VDx<( alpha )-VD0.5( beta ); -37 and -7 for VD0.5( beta )-VD0.7( alpha '); -21 and -8.5 for VH( beta ')-VH2( epsilon ); and -23 and -8 for VD( alpha ')-VD2( epsilon ). The hydriding-dehydriding kinetics were dominated by surface effects.Keywords
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