Erbium tetraboride explained

Erbium tetraboride is a boride of the lanthanide metal erbium.^[1]

It is hard and has a high melting point. Industrial applications of erbium boride include use in semiconductors, the blades of gas turbines, and the nozzles of rocket engines.^[2]

Notes and References

1. Book: Perry, Dale L. Handbook of Inorganic Compounds. Taylor & Francis. 2011. 2. 163. 9781439814628. 14 December 2013.
2. http://www.americanelements.com/erb.html American Elements