There is a paper- "First Principles study of Electronic structure, structural Properties and superconductivity of Nickel Hydride" with the following relevant information:
"Our result conclude, a non occurrence of superconductivity in NiH. But, due to the addition of hydrogen atom we observe superconductivity in NiH2 and NiH3. The estimated Tc values for NiH2 and NiH3 are 5.5K and 10K respectively. Also, it is found that as the pressure increases, the Tc value also increases" http://wjst.wu.ac.th/index.php/wjst/article/downloadSuppFile/231/27 In Ahern's work for EPRI, based loosely on Arata's work, he achieved hydrogen loading of > 4:1 in an alloy of Ni(95%)-Pd(5%). However, this alloy was not his best performer for thermal gain, but it did load -by far- the most hydrogen. The gain was much better than with Pd-H or Ni-H. Curiously nickel alone does not load well. Details like this are what is so annoying (devilish) about LENR, where the common belief is that hydrogen loading correlates with gain. There is evidence of this correlation with deuterium, but not with hydrogen. Otherwise the best advice which could be given to Mizuno would be to add 5% Pd to his nickel. BTW ... although NiH4 would not be superconductive at temperatures where excess heat is triggered, at least not in the normal sense, there is a mounting suspicion that materials which are superconductive at low temperature may retain something unusual at high temps ... and it involves magnetism and "nano". That "something" can be labeled as "local superconductivity". Local superconductivity would look a lot like spintronics in nanoparticles. The Meissner effect would then itself be local and would cause extreme antiferromagnetic "ordering" in nanoparticles (which are relatively mobile). Note: many experts do not yet fully recognize antiferromagnetism as another kind of ordering ... but it can be, especially in the extreme case. And the interesting thing is that antiferromagnetism can emerge from a state of increasing disorder. At least in a philosophical sense, when there is anti-entropic oscillation between ordered and disordered states, there exists the potential for an energy anomaly.
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