The superconducting transition temperatures in PdDx samples were measured in the deuterium concentration interval 0.72 ≤ x ≤ 0.85. These results are compared with similar data for PdHx so as to obtain the isotope effect ΔTc in this concentration region. It is shown that the observed ΔTc (x) is in qualitative agreement with theory, but the experimental values of ΔTc (x) are slightly larger than the theoretical ones.
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