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Note A at Iridium says "At room temperature and standard atmospheric pressure, iridium has been calculated to have a density of 22.65 g/cm3 (0.818 lb/cu in), 0.04 g/cm3 (0.0014 lb/cu in) higher than osmium measured the same way.
Osmium is a hard, brittle, blue-gray metal, and the densest stable element—about twice as dense as lead. The density of osmium is slightly greater than that of iridium; the two are so similar (22.587 versus 22.562 g/cm 3 at 20 °C) that each was at one time considered to
These toxic chemicals are avoided today in consideration of the fact that there are alternative water based, non-toxic heavy liquids like sodium polytungstate solutions. [1] With this relatively new heavy liquid densities up to 3.1 g·cm −3 can be adjusted . Adding parts of pulverulent tungsten carbide increases the density to 4.6 g·cm −3. [2]
Unfortunately I suspect the degree of accuracy required to split these two elements means that the values will be controversial. In fact, depending on the method used to determine density, iridium may be 22.56-22.65 g/cm^3 while iridium may be 22.59-22.61 g/cm^3. I think the best we can do is keep this list up to date with the main articles.
— "Values ranging from 21.3 to 21.5 gm/cm 3 at 20 °C have been reported for the density of annealed platinum; the best value being about 21.45 gm/cm 3 at 20 °C." 21.46 g/cm 3 — Rose, T. Kirke. The Precious Metals, Comprising Gold, Silver and Platinum .
Synthesis occurs at high temperatures (~1000 °C) from a mixture of MgB 2 and OsCl 3. [37] Three osmium borides are known: OsB, Os 2 B 3 and OsB 2. The first two have hexagonal structure, [38] similar to that of rhenium diboride. Osmium diboride was first also sought as hexagonal, [39] but one of its phases was later reassigned to orthorhombic.
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