Copper oxide selenite

Copper oxide selenite
Identifiers
3D model (JSmol)	Interactive image;
CompTox Dashboard (EPA)	DTXSID801336785;
	InChI InChI=1S/2Cu.H2O3Se.O/c;;1-4(2)3;/h;;(H2,1,2,3);/q2*+1;;-2/p-2 Key: CGYPTBPQZTWRHL-UHFFFAOYSA-L;
	SMILES [O-][Se](=O)[O-].[Cu+].[Cu+].[O-2];
Properties
Chemical formula	Cu2OSeO3
Molar mass	270.059 g/mol
Appearance	Green dodecahedral crystals
Density	5.1 g/cm3
Band gap	2.5 eV
Thermal conductivity	400 W/(m·K) (9 K)
Refractive index (nD)	3.8 (100 K, 1 kHz)
Structure
Crystal structure	Cubic
Space group	P213, #198, cP56
Lattice constant	a = 0.8924 nm
Formula units (Z)	8
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Copper oxide selenite is an inorganic compound with the chemical formula Cu₂OSeO₃. It is an electrically insulating, piezoelectric and piezomagnetic material, which becomes a ferrimagnet upon cooling below 58 K. As of 2021, Cu₂OSeO₃ is the only insulating material that hosts magnetic skyrmions.

Identifiers
3D model (JSmol)	Interactive image
CompTox Dashboard (EPA)	DTXSID801336785
InChI InChI=1S/2Cu.H2O3Se.O/c;;1-4(2)3;/h;;(H2,1,2,3);/q2*+1;;-2/p-2 Key: CGYPTBPQZTWRHL-UHFFFAOYSA-L
SMILES [O-][Se](=O)[O-].[Cu+].[Cu+].[O-2]
Properties
Chemical formula	Cu₂OSeO₃
Molar mass	270.059 g/mol
Appearance	Green dodecahedral crystals
Density	5.1 g/cm³
Band gap	2.5 eV
Thermal conductivity	400 W/(m·K) (9 K)
Refractive index (n_D)	3.8 (100 K, 1 kHz)
Structure
Crystal structure	Cubic
Space group	P2₁3, #198, cP56
Lattice constant	a = 0.8924 nm
Formula units (Z)	8
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references