Niobium triselenide is an inorganic compound belonging to the class of transition metal trichalcogenides.

It was the first reported example of one-dimensional compound to exhibit the phenomenon of sliding charge density waves.

[1] Due to its many studies and exhibited phenomena in quantum mechanics, niobium triselenide has become the model system for quasi-1-D charge density waves.

[3][4] The compound is prepared by the solid state reaction by heating niobium and selenium at 600 to 700 °C: The resulting black crystals can contain NbSe2 impurities.

This observation is explained by the charge density wave formations that open the gaps in the Fermi surface.