Molybdenum disulfide [molybdenum(IV) sulfide, MoS2] is an inorganic compound in the mineral molybdenite. Its crystals have a layered hexagonal structure (shown) similar to graphite. In 1957, Ronald E. Bell and Robert E. Herbert at the now-defunct Climax Molybdenum Company of Michigan (Ann Arbor) prepared what was then a new rhombohedral crystalline. Like most mineral salts, MoS2 has a high melting point but begins to sublime at a relatively low 450 ºC. This property is useful for purifying the compound—form of MoS2. Rhombohedral crystals were subsequently discovered in nature. Because of its layered structure, hexagonal MoS2, like graphite, is an excellent “dry” lubricant. It and its cousin, tungsten disulfide, can be used as surface coatings on machine parts (e.g., in the aerospace industry), in two-stroke engines (the type used for motorcycles), and in gun barrels (to reduce friction between the bullet and the barrel). Unlike graphite, MoS2 does not depend on adsorbed water or other vapors for its lubricant properties. It can be used at temperatures as high as 350 ºC in oxidizing environments and up to 1100 ºC in nonoxidizing environments. Its stability makes it useful in high-temperature applications where oils and greases are impractical. In addition to its lubricating properties, MoS2 is a semiconductor. It is also known that it and other semiconducting transition-metal chalcogenides become superconductors at their surfaces when doped with an electrostatic field. The mechanism of superconductivity was uncertain until 2018 when Andrea C. Ferrari at the University of Cambridge (UK) and colleagues there and at the Polytechnic Institute of Turin (Italy) reported that a multivalley Fermi surface is associated with the superconductivity state in MoS2. The authors believe “this [Fermi surface] topology will serve as a guideline in the quest for new superconductors.” If you are looking for high quality, high purity, and cost-effective Molybdenum disulfide, or if you require the latest price of Molybdenum disulfide, please feel free to email contact mis-asia.