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iridium
[ ih-rid-ee-uhm, ahy-rid- ]
noun
- a precious metallic element resembling platinum: used in platinum alloys and for the points of gold pens. : Ir; : 192.2; : 77; : 22.4 at 20°C.
iridium
/ ɪˈrɪd-; aɪˈrɪdɪəm /
noun
- a very hard inert yellowish-white transition element that is the most corrosion-resistant metal known. It occurs in platinum ores and is used as an alloy with platinum. Symbol: Ir; atomic no: 77; atomic wt: 192.22; valency: 3 or 4; relative density: 22.42; melting pt: 2447°C; boiling pt: 4428°C
iridium
/ ĭ-rĭd′ē-əm /
- A rare, whitish-yellow element that is the most corrosion-resistant metal known. It is very dense, hard, and brittle, and is is used to make hard alloys of platinum for jewelry, pen points, and electrical contacts. Atomic number 77; atomic weight 192.2; melting point 2,410°C; boiling point 4,130°C; specific gravity 22.42 (at 17°C); valence 3, 4.
- See Periodic Table
Word History and Origins
Word History and Origins
Origin of iridium1
A Closer Look
Example Sentences
Researchers report a new method that reduces the amount of iridium needed to produce hydrogen from water by 95%, without altering the rate of hydrogen production.
The sample is then coated with a thin layer of iridium metal to make it conductive.
This will not only replace the rare, more costly ruthenium and iridium compounds, which today are still the most frequently used, but even enable reaction and substrate classes that are unavailable with the classical compounds.
However, OLEDs can include rare, expensive metals like iridium.
The research team focused on finding alternatives to precious metal catalysts like platinum and iridium, which exhibit stability in acidic conditions.
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