Deformation of Palladium Plates by a Small Stress during Hydrogen Absorption and Desorption

Physics – Condensed Matter – Materials Science

Scientific paper

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13 pages, 11 figures, Submitted to J. Phys. Soc. Jpn

Scientific paper

We observed an unexpected bending of a horizontally held palladium plate at 150$^{\circ}$C under a small shearing stress. The deformation was fastest at the nominal composition of PdH$_{{\rm 0.1-0.2}}$, which is near the point of spinodal decomposition into the $\alpha+\beta$ phase. This infers a kind of superplasticity that occurs in connection with structural instability caused by intruding hydrogen atoms. We also observed that a plate warped back and forth during a cycle of absorption and desoprtion of hydrogen when it was hung vertically, which does not have a reasonable explanation.

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