D. L. Windt, W. C. Cash, M. Scott, P. Arendt, B. Newnam, R. F. Fisher, A. B. Swartzlander. Optical constants for thin films of Ti, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Hf, Ta, W, Re, Ir, Os, Pt, and Au from 24 Å to 1216 Å, Appl. Opt.27, 246-278 (1988)
Tantalum (Ta) is a dense, hard, grayish-blue metal that is highly corrosion-resistant. It is part of the refractory metals group, which are characterized by their high melting points and resistance to wear, corrosion, and deformation. Due to its inertness, tantalum is often used in the manufacture of medical implants and surgical instruments, ensuring they don't react with bodily fluids. In the electronics industry, tantalum is used to make capacitors, which are key components in many electronic devices, especially mobile phones and computers. Its ability to form a stable oxide layer on its surface, known as tantalum pentoxide, is crucial for this application. Additionally, the metal is used in the production of superalloys for jet engine components, nuclear reactors, and missile parts due to its high-temperature strength and melting point.