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https://www.starcojewellers.com.au/r-jewelry/rhenium-diboride-jewelry.html
The most common oxidation states are +2, + 4, +6, and +7. Rhenium-185 is the only stable isotope. The metal also forms a number of compounds, including sulfides, oxides, oxyhalides, and halides. Rhenium diboride, for example, has hardness that is comparable to compounds such as zirconium diboride, titanium diboride, and silicon carbide.
https://orchid.ganoksin.com/t/rhenium-platinum-alloy/35839
Rhenium diboride (ReB2) is a synthetic superhard material. It was first synthesized in 1962 and re-emerged recently due to hopes of achieving high hardness comparable to that of diamond. The reported ultrahigh hardness has been questioned, although this is a matter of definition as in the initial test rhenium diboride was able to scratch diamond.Estimated Reading Time: 3 mins
https://clever-geek.imtqy.com/articles/1094639/index.html
The hardness of a rhenium diboride crystal is very different along different crystallographic planes, since layers of rhenium and boron atoms alternating in hexagonal lattices alternate in its crystal structure (see Fig.). In hardness (~ 22 GPa, according to Vickers), it is noticeably inferior to diamond (~ 70–80 GPa) and is comparable with such solid substances as tungsten carbide, titanium ...
https://pubmed.ncbi.nlm.nih.gov/27718568/
Rhenium diboride (ReB 2), containing corrugated layers of covalently bonded boron, is a superhard metallic compound with a microhardness reaching as high as 40.5 GPa (under an applied load of 0.49 N).Tungsten diboride (WB 2), which takes a structural hybrid between that of ReB 2 and AlB 2, where half of the boron layers are planar (as in AlB 2) and half are corrugated (as in ReB 2), has been ...Cited by: 20
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