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Gadolinium diiodide
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<p>Gadolinium diiodide is an <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a>, with the <a href="/facts/Chemical_formula/hghUtthl">chemical formula</a> of GdI2. It is an <a href="/facts/Electride/2Lp8eUIK">electride</a>, with the ionic formula of Gd3+(I−)2e−, and therefore not a true gadolinium(II) compound. It is <a href="/facts/Ferromagnetic/fH3HFnSl">ferromagnetic</a> at 276 K with a <a href="/facts/Saturation_magnetization/QvhGEldn">saturation magnetization</a> of 7.3 B; it exhibits a large negative <a href="/facts/Magnetoresistance/nlDGnyrw">magnetoresistance</a> (~70%) at 7 T near room temperature. It can be obtained by reacting <a href="/facts/Gadolinium/eLYUeScu">gadolinium</a> and <a href="/facts/Gadolinium(III)_iodide/rBR5y0T8">gadolinium(III) iodide</a> at a high temperature: </p> Gd + 2 GdI3 → 3 GdI2 <p>It can react with hydrogen at high temperature (800 °C) to obtain gadolinium hydrogen iodide (GdI2H0.97). </p>