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Because of its hardness, brittleness, and very high melting point, solid iridium is difficult to machine, form, or work; thus powder metallurgy is commonly employed instead. [12] It is the only metal to maintain good mechanical properties in air at temperatures above 1,600 °C (2,910 °F). [13]
The Gmelin rare earths handbook lists 1522 °C and 1550 °C as two melting points given in the literature, the most recent reference [Handbook on the chemistry and physics of rare earths, vol.12 (1989)] is given with 1529 °C.
Rhodium has both a higher melting point and lower density than platinum. It is not attacked by most acids as it is completely insoluble in nitric acid and dissolves slightly in aqua regia. Iridium is mainly used as a hardening agent for platinum alloys.
Osmium and iridium are chemically inert in ambient conditions. [9] ... The table lists the melting points of the oxides of the noble metals, and for some of those of ...
Most definitions of the term 'refractory metals' list the extraordinarily high melting point as a key requirement for inclusion. By one definition, a melting point above 4,000 °F (2,200 °C) is necessary to qualify, which includes iridium, osmium, niobium, molybdenum, tantalum, tungsten, rhenium, rhodium, ruthenium and hafnium. [2]
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Spectral lines of iridium: ... phase comment = | melting point K = | melting point C = | melting point F = | melting point ref = | melting point comment = | boiling ...
Melting point: 1,100 °C (2,010 °F; 1,370 K) decomposes Solubility in water. ... Iridium(IV) oxide, IrO 2, is the only well-characterised oxide of iridium. It is a ...