A palladium hydride superconductor, PdyHx where yHx is 1Hx, 2Hx, or 3Hx, having a critical temperature Tc ≥ 11 K and stoichiometric ratio x ≥ 1. The critical temperature is proportional to a power of the stoichiometric ratio, which is stable over periods of exceeding 24 hours, temperature variations from 4 K to 400 K, and pressures down to 1 mbar. The palladium hydride is coated with a stabilizing material such as a metal, metal oxide, ceramic or polymer that can bond to palladium. It can be made by electrochemically loading a palladium lattice with isotopic hydrogen in an electrolytic solution, by allowing isotopic hydrogen to diffuse into a palladium thin film in a pressure chamber, or by injecting isotopic hydrogen into a palladium thin film in a vacuum chamber. The stabilizing material can be electrochemically bonded to the surface of the palladium hydride, or deposited using chemical vapor deposition or molecular beam epitaxy.
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