{{Short description|Palladium diselenide mineral}} '''Verbeekite''' is a rare mineral consisting of '''palladium diselenide''' PdSe<sub>2</sub>. This transition metal dichalcogenide has an unusual monoclinic structure, with pairs of selenium atoms existing as dimers forming layers between palladium atom sheets. Unit cell dimensions are: {{nowrap|a {{=}} 6.710}}, {{nowrap|b {{=}} 4.154}}, {{nowrap|c {{=}} 8.914 Å}}, {{nowrap|β {{=}} 92.42 °}}, {{nowrap|V {{=}} 248.24 Å<sup>3</sup>}}. Palladium diselenide has five polymorphs. Verbeekite can be synthesised at 11.5 GPa pressure and 1300 °C.<ref>{{cite journal|last1=Selb|first1=Elisabeth|last2=Tribus|first2=Martina|last3=Heymann|first3=Gunter|title=Verbeekite, the long-unknown crystal structure of monoclinic PdSe<sub>2</sub>|journal=Inorganic Chemistry|date=26 April 2017|volume=56|issue=10|pages=5885–5891|doi=10.1021/acs.inorgchem.7b00544|pmid=28445041}}</ref>
Monolayer PdSe<sub>2</sub> has been predicted as a semiconductor and synthesized as an electronic material.<ref>{{cite journal |last1=Sun |first1=Jifeng |title=Electronic, transport and optical properties of bulk and monolayer PdSe<sub>2</sub> |journal=Applied Physics Letters |date=2015 |volume=107 |issue=15 |page=153902 |doi=10.1063/1.4933302 |bibcode=2015ApPhL.107o3902S |osti=1265984 }}</ref><ref>{{cite journal |last1=Oyedele |first1=Akinola |title=PdSe<sub>2</sub>: Pentagonal two-dimensional layers with high air stability for electronics |journal=Journal of the American Chemical Society |date=2017 |volume=139 |issue=40 |pages=14090–14097 |doi=10.1021/jacs.7b04865 |pmid=28873294 |bibcode=2017JAChS.13914090O |osti=1394440 }}</ref>
The mineral was discovered in 2002 from the Musonoi Cu-Co-Mn-U mine (Kolwezi), in the Democratic Republic of the Congo. Verbeekite was named after geologist Théodore Verbeek who studied minerals at that mine between 1955 and 1967.<ref>[https://www.mindat.org/min-25640.html Mindat data]</ref>
==References== {{Reflist}} {{portal bar |Chemistry |Geology}} Category:Selenide minerals Category:Palladium minerals Category:Transition metal dichalcogenides