Materials Project GGA structure of Gd2Fe14B (68-atom cell), unmodified. Ferrimagnet with the highest Tc of the R2Fe14B family (~661 K); lower Ms and anisotropy field than Nd2Fe14B.
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Gadolinium's big moment doesn't make a permanent magnet: a literature check
Gd has the largest saturation magnetization of any common element, but only below 293 K. In Fe and Co compounds it points the wrong way, and it adds almost no anisotropy. Sources, measured values, CIFs, and what it would take to test it ourselves.
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