Samarium disilicide

Last updated
Samarium disilicide
Names
Other names
Samarium silicide, samarium(II) silicide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.032.324 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 235-570-1
  • InChI=1S/2Si.Sm
    Key: XDMXYDKSBNQCCH-UHFFFAOYSA-N
  • [Si].[Si].[Sm]
Properties
Si2Sm
Molar mass 206.53 g·mol−1
AppearanceCrystals
Density 7.54 g/cm3
insoluble
Structure
Orthorhombic
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).

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

Contents

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

  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.
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