Abstract
Thermodynamic and magnetic properties of the Pd 0.93 Ag 0.07 hydrides were measured. The isotherms of Pd 0.93 Ag 0.07 -H and -D systems in the temperature range 373-523 K showed the plateau regions to be within 0.05 < [Q (Q = H or D)]/[Pd 0.93 Ag 0.07 ] < 0.4. From an investigation of the thermodynamic isotope effect for the formation and decomposition of hydride, the enthalpy changes, ΔH° β→α , for desorption of hydrogen and deuterium were evaluated to be 43.0 kJ/mol H2 and 36.4 kJ/mol D2 , respectively. It was observed that the magnetization of Pd 0.93 Ag 0.07 Hx at ambient temperature increased with increasing magnetic field. Since the magnetization was not saturated up to 7 T, it can be concluded that Pd 0.93 Ag 0.07 H x is paramagnetic. The magnetic susceptibility of Pd 0.93 Ag 0.07 H x progressively decreased with increasing hydrogen content and vanished at [H]/[Pd 0.93 Ag 0.07 ] = 0.4. The disappearance of the susceptibility coincided with the termination of the plateau region of the isotherms. This fact can be explained by the rigid band model, according to which the vacant part of d-band of Pd 0.93 Ag 0.07 can accept electrons from absorbed hydrogen atoms.
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
