Effect of Current Density on Thermodynamic Properties of Nanocrystalline Palladium Capped Samarium Hydride Thin Film Switchable Mirrors

Kumar, Pushpendra; Malhotra, L. K.

doi:https://doi.org/10.1155/2007/52083

Journal of Nanomaterials

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Surface Nanoscience

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Volume 2007 | Article ID 052083 | https://doi.org/10.1155/2007/52083

Effect of Current Density on Thermodynamic Properties of Nanocrystalline Palladium Capped Samarium Hydride Thin Film Switchable Mirrors

Pushpendra Kumar^1,2and L. K. Malhotra²

Academic Editor: Rakesh K. Joshi

Received20 Nov 2006

Accepted12 Dec 2006

Published11 Feb 2007

Abstract

A 55 nm samarium film capped with a 10 nm palladium overlayer switched from a metallic reflecting to a semiconducting, transparent in visible state during ex-situ hydrogen loading via electrochemical means in 1 M KOH electrolytic aqueous solution at room temperature. The switching between metal to semiconductor was accompanied by measurement of transmittance during hydrogen loading/unloading. The effect of current density on switching and thermodynamic properties was studied between dihydride state (FCC phase) and trihydride state (hexagonal phase). From the plateau of partial pressure of hydrogen at x=2.6, enthalpy of formation was calculated at different current densities. The diffusion coefficients and switching kinetics are shown to depend on applied current density.

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Copyright

Copyright © 2007 Pushpendra Kumar and L. K. Malhotra. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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