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Tantalum Oxide - Ta₂O₅

Classification: Oxide
Atomic numbers: 73 & 8
Atomic weight: 441.76
Melting point (C): 1470, del.
Boiling point (C):
Density (g/cm3): 8.7 approx.
Refractive index (n=):
Hardness (Mosh-scratch): 7-8
Crystal structure: Hexagonal-rhombohedral: (10T0) rhomb
Color (solid): Clear/greyish
Cleavage: Basal: (0001)