Molybdenum hexafluoride and rhenium hexafluoride are liquids. These elements are vanadium, rubidium, indium, lanthanum, europium, rhenium and lutetium. Some molybdenum ores contain 0.001% to 0.2% rhenium. Similar carbonyls are formed by technetium's congeners, manganese and rhenium. Like rhenium and palladium, technetium can serve as a catalyst. Investigation indicates that addition of rhenium and tantalum increases oxidation resistance. Byproducts of silver, rhenium, and palladium metals would also be recovered. Technetium is located in the seventh group of the periodic table, between rhenium and manganese. Desirable materials for gaskets are strong, stiff metals such as rhenium or tungsten. Modern turbine blades often use nickel-based superalloys that incorporate chromium, cobalt, and rhenium. Quantities of palladium and rhenium also occur in the deposit. Unlike the case for rhenium, a trioxide has not been isolated for technetium. Technetium, rhenium, and bohrium have no known biological roles. Iron and gallium trifluorides have the FeF structure, which is similar to rhenium trioxide. ReO. The red rhenium trioxide ReO adopts a perovskite-like structure.