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Refractory elements

Any chemical element that vaporises (that is, boils) at high temperatures or condenses from a gas at high temperatures. Examples are calcium (Ca), aluminium (Al), uranium (U), titanium (Ti), the rare earth elements such as cerium (Ce), europium (Eu), and gadolinium (Gd); tungsten (W), zirconium (Zr), and thorium (Th). The opposite of refractory is volatile.

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