Word: tantalum
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Dates: during 1930-1939
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...only factor limiting the temperature in the new Harvard furnace is the melting point of the crucible. The best crucibles obtainable at present are made of tantalum, lined with thorium oxide. Both substances melt at about 5000 degrees Fahrenheit...
These preliminary experiments have indicated that out of the fifty-five metallic elements, only six have melting points beyond the reach of the Harvard apparatus in its present state. These are carbon, melting at 6300 degrees Fahrenheit; tungsten, at 6066 degrees; rhenium, at 5400 degrees; tantalum, at 5130 degrees; osium, at 4860 degrees and molybdenum at 4716 degrees...