Materials Project GGA structure of Th2Ni17-type Gd2Co17, unmodified. Experimental phase, but MP puts it 0.72 eV/atom above the hull, an artifact of GGA treatment of Gd 4f. Measured K1 is negative at room temperature (easy plane).
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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.
/materials/structure/relax
/materials/thermo/ehull
/magnetism/curie-temperature