Samarium disilicide

Samarium disilicide
Names
	Other names Samarium silicide, samarium(II) silicide
Identifiers
CAS Number	12300-22-0 ;
3D model (JSmol)	Interactive image;
ChemSpider	50645108;
ECHA InfoCard	100.032.324
EC Number	235-570-1;
CompTox Dashboard (EPA)	DTXSID101312447;
	InChI InChI=1S/2Si.Sm Key: XDMXYDKSBNQCCH-UHFFFAOYSA-N;
	SMILES [Si].[Si].[Sm];
Properties
Chemical formula	Si2Sm
Molar mass	206.53 g·mol−1
Appearance	Crystals
Density	7.54 g/cm3
Solubility in water	insoluble
Structure
Crystal structure	Orthorhombic
Space group	α-SmSi2 orthorhombic; β-SmSi2 tetragonal
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Samarium disilicide is a binary inorganic compound of samarium and silicon with the chemical formula SmSi₂.^[1]^[2]

Synthesis

SmSi₂ is prepared by reducing samarium oxide with silicon in vacuum at 1550-1600 °C.

Physical properties

Samarium disilicide exists in two crystalline modifications: α-SmSi₂ and β-SmSi₂, with lattices of the YSi₂ orthorhombic (space group I mma) and ThSi₂ tetragonal (space group I41/amd.^[3]) types respectively and a transformation temperature of 380 °C.^[4]

The compound melts congruently at a temperature of ≈1800 °C.^[5]

References

^ Kuzmin, M. V; Remele, V. E. (2025). "Numerical model for studying 3D-island films by Auger electron spectroscopy. The Sm-Si(111)". Physics of the Solid State (1): 177. Retrieved 29 June 2025.
^ Costescu, Ruxandra M.; Gheorghe, Nicoleta G.; Husanu, Marius A.; Lungu, George A.; Macovei, Dan; Pintilie, Ioana; Popescu, Dana G.; Teodorescu, Cristian M. (1 October 2012). "Epitaxial ferromagnetic samarium and samarium silicide synthesized on Si(001)". Journal of Materials Science. 47 (20): 7225–7234. Bibcode:2012JMatS..47.7225C. doi:10.1007/s10853-012-6672-z. ISSN 1573-4803. Retrieved 29 June 2025.
^ Donnay, Joseph Désiré Hubert (1973). Crystal Data: Inorganic compounds. National Bureau of Standards. p. T-173. Retrieved 29 June 2025.
^ Samsonov, G. V. (December 1962). "THE CHEMISTRY OF THE SILICIDES OF THE RARE-EARTH ELEMENTS". Russian Chemical Review: 710. Retrieved 29 June 2025.
^ Gokhale, A. B.; Abbaschian, G. J. (1 October 1988). "The Si-Sm (Silicon-Samarium) system". Bulletin of Alloy Phase Diagrams. 9 (5): 582–585. doi:10.1007/BF02881960. ISSN 0197-0216. Retrieved 29 June 2025.

[1] Kuzmin, M. V; Remele, V. E. (2025). "Numerical model for studying 3D-island films by Auger electron spectroscopy. The Sm-Si(111)". Physics of the Solid State (1): 177. Retrieved 29 June 2025.

[2] Costescu, Ruxandra M.; Gheorghe, Nicoleta G.; Husanu, Marius A.; Lungu, George A.; Macovei, Dan; Pintilie, Ioana; Popescu, Dana G.; Teodorescu, Cristian M. (1 October 2012). "Epitaxial ferromagnetic samarium and samarium silicide synthesized on Si(001)". Journal of Materials Science. 47 (20): 7225–7234. Bibcode:2012JMatS..47.7225C. doi:10.1007/s10853-012-6672-z. ISSN 1573-4803. Retrieved 29 June 2025.

[3] Donnay, Joseph Désiré Hubert (1973). Crystal Data: Inorganic compounds. National Bureau of Standards. p. T-173. Retrieved 29 June 2025.

[4] Samsonov, G. V. (December 1962). "THE CHEMISTRY OF THE SILICIDES OF THE RARE-EARTH ELEMENTS". Russian Chemical Review: 710. Retrieved 29 June 2025.

[5] Gokhale, A. B.; Abbaschian, G. J. (1 October 1988). "The Si-Sm (Silicon-Samarium) system". Bulletin of Alloy Phase Diagrams. 9 (5): 582–585. doi:10.1007/BF02881960. ISSN 0197-0216. Retrieved 29 June 2025.

[1]

[2]

[3]

[4]

[5]