2 Reaction of a metal hydride with a sulfur compound. 7H 2 Reduction of metallic sulfates. General Properties Many sulfides have melting points above those of oxides. Sulfides are generally hydrolyzed by water. Sulfides generally oxidize readily in moist air at ambient temperature or in dry air at elevated temperature.
Some sulfides possess semi-metallic character and have potentially valuable electronic properties.
Rare earth sulfides are semi-conductors and have been used in thermoelectric devices. Alkaline earth sulfides plus those of calcium and zinc are used for phosphor compositions. Molybdenum and tungsten sulfides are widely used, non-graphitic commercial lubricants. Small lots are promptly available from stock for experimental or test purposes. Production quantities of many sulfides are also available from stock.