Refractory metal is a metal having an extremely high melting point, for example tungsten, molybdenum, niobium, tantalum, and rhenium
Generalic, Eni. "Refractory metal." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
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Periodic Table