Zirconium Sputtering Target Zirconium (Zr) is a silver metal with a density of 6.52 g/cm3. Zr has a very small neutron adsorption cross-section and relatively high melting point (1855 °C or 3371 °F), making zirconium a great material for nuclear power rods. Zirconium sponge and crystal bars are the raw materials to make sputtering targets. Although Zr sponge is cheap and has low purity, it contains a high oxygen content. Zirconium crystal bars have a higher cost and purity, making them ideal materials for sputtering targets. http://www.zirconiumbar.com/