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Additional Resources for you to Explore
For all the basics about hafnium, check out the Visual Elements Periodic Table.
For amazing photos and facts about hafnium, check out The Elements by Theodore Gray.
Some superalloys, used for special applications, contain hafnium. C103, which consists of 89% Nb, 10% Hf and 1% Ti is an alloy used for liquid rocket thruster nozzles, such as those found in the main engine of the Apollo lunar modules.