Holmium monosulfideHolmium monosulfide is a binary inorganic compound of holmium and sulfur with the chemical formula HoS.SynthesisHeating stoichiometric amounts of pure substances in an inert atmosphere:Physical propertiesHolmium monosulfide forms crystals of cubic system, space group Fm3''m'', unit cell parameter a = 0.5465 nm, Z = 4, isomorphous with NaCl.UsesHoS is an attractive material for potential application in electronic and magnetic recording devices.