... ceramics, piezoelectric ceramics and ceramic capacitor 1. Molecular Formula: Ta2O5 2. Molecular Weight: 441.8 3. Appearance: powder shape, white ... , white three party crystals or powder, density 8.2 g/cm3. Mp 1785 °C. Insoluble in water, soluble in ethanol, acid, hydrofluoric ... acid. Both sexes oxides, the chemical stability, 2500 °C and 5.0 X105Pa didn't be H2 reduction, tantalum ...