Abstract
It was observed experimentally that hydrogen affects strongly the magnetic properties of metals and alloys. Recently, we performed a series of first-principles calculations to study the effect of hydrogen on the magnetism of magnetic metals, and we found that the strong hybridization among the orbitals of hydrogen and nickel atoms suppresses the ferromagnetism completely. On the basis of this first-principles calculation, we developed a statistical thermodynamic model and analyzed the experimental results of hydrogen solubility in transition metals Fe, Co, and Ni using the model. We found that our model can describe the temperature dependence of hydrogen solubility in a wide range of solid phase in the stated magnetic metals.
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