Niobium pentoxide

Appearance：black or white particles

Density:4.47grams per cubic centimeter

Friction hardness：5-6

Melting point:1485℃

Solubility: insoluble in water,soluble in  acid

Light transmission range:350-7000nm

Refractive index（500nm）：2.3

Evapration condition :electron  gun oxygenation

Evapration temperature:1800-1900℃

Purity:99.99%