12067-46-8

-325 mesh black powder(s); dry, solid lubricant with exceptional stability at high temperatures, and in high vacuum; used in the form of 99.8% pure material as a sputtering target to produce lubricant films [HAW93] [CER91] [AES93]

TLV: 5 mg(W)/m3.

Tungsten(IV) selenide is used as an important compound in electrochemical solar cells. It acts as a stable semiconductor.

Tungsten diselenide, WSe2, has a hexagonal crystalline structure comparable to MoS2. Every tungsten atom is covalently bonded to six selenium ligands in a trigonal prismatic coordination sphere, and each selenium is bonded to three tungsten atoms in a pyramidal geometry. Heating thin films of tungsten under pressure from gaseous selenium and high temperatures ( . 527℃/800K) using the sputter deposition technique leads to the films crystallizing in hexagonal structures with the correct stoichiometric ratio.
W+ 2Se→WSe2