Niobium pentoxide  (Nb₂O₅)

Appearance:                  black pellets 

Density:                     4.47 g/cm³

Vapor pressure:               1 Pa at 1150℃      10 Pa at1300℃

Hardness(Mohs hardness):     5-6

Melting point:                 1485℃

Solubility:                    non-soluble in water, soluble in acid

Transmittance scope:           350-7000nm

Refractive index(500nm):       2.30

Vapour deposition condition:     evaporated by electron gun, oxygen added

Vapour deposition temp.:        1800-1900℃

Purity:        >99.99%

Applications:  anti-reflection film, interference filter

Specs:       0.5-1mm   1-2mm    1-3mm