Holmium(III) sulfide is the sulfide salt of holmium, with the chemical formula of .
Preparation Holmium(III) sulfide can be obtained by the reaction of holmium(III) oxide and hydrogen sulfide at 1325 °C.
It can also be prepared by treating holmium(III) sulfate with hydrogen sulfide at elevated temperatures.
In another preparation, it can be produced by treating metallic holmium with sulfur:
Once prepared, holmium(III) sulfide can be purified by chemical vapor transport using iodine.
Properties Holmium(III) sulfide has orange-yellow crystals in the monoclinic crystal system, with the space group P21/m (No. 11). Under high pressure, holmium(III) sulfide can form in the cubic and orthorhombic crystal systems.
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