A brief overview of the impact of presence of hydrogen in metallic systems on magnetic properties is given. Respective differences between the 4f, 5f, and 3d system are emphasized using examples of materials with similar crystal structure.
The analysis is based on general aspects of H bonding in metallic environment, H expanding volume and polar bonding of H. Electronegativity is used as a convenient indicator quantifying the polar bonding character. (c) 2021 Elsevier B.V.
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