Praseodymium disilicide

Last updated
Praseodymium disilicide
Names
IUPAC name
bis(λ2-silanylidene)praseodymium
Other names
Praseodymium silicide, praseodymium(II) silicide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.872 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 235-072-4
PubChem CID
  • InChI=1S/Pr.2Si
    Key: ZCMRYZQUCFDADZ-UHFFFAOYSA-N
  • [Si]=[Pr]=[Si]
Properties
PrSi2
Molar mass 197.078 g·mol−1
AppearanceDark gray powder
Density 5.46 g/cm3
Melting point 1,712 °C (3,114 °F; 1,985 K)
insoluble
Structure
Orthorhombic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Praseodymium disilicide is a binary inorganic compound of praseodymium and silicon with the chemical formula PrSi2. [1] [2]

Contents

Synthesis

Fusion of stoichiometric amounts of pure substances: [1]

Pr + 2Si → PrSi2

Physical properties

Praseodymium disilicide forms crystals of orthorhombic system, spatial group I ma, cell parameters a = 0.417 nm, b = 0.411 nm, c = 1.385 nm, Z = 4, the structure type of gadolinium disilicide. [3]

At a temperature of 123-147 °C, a phase transition occurs into tetragonal system, [4] spatial group I 41/amd, cell parameters a = 0.4140 nm, c = 1.364 nm, Z = 4, the structure type of thorium disilicide. [5]

The compound melts congruently at a temperature of 1712 °C and has a wide homogeneity range of 64-66.7 atm.% silicon (sometimes the compound formula is written as PrSi1.8). [6]

At a temperature of 11.5 K, the compound demonstrate a transition to the ferromagnetic state. [7]

Uses

Praseodymium disilicide is a dense material known for its exceptional hardness, high melting temperature, and reliable mechanical and thermal stability. The compound also exhibits distinctive electrical and magnetic properties, making it well-suited for applications such as protective coatings in reactors, electronic devices, and magnetic material components. [1]

References

  1. 1 2 3 "Praseodymium Disilicide Powder, PrSi2, CAS 12066-83-0 - Heeger Mate..." Heeger Materials Inc. Retrieved 3 July 2025.
  2. ↑ "Praseodymium Silicide | CAS 12066-83-0 | PrSi2 | AMERICAN ELEMENTS". American Elements . Retrieved 3 July 2025.
  3. ↑ Boutarck, N.; Pierre, J.; Lambert-Andron, B.; L'Heritier, Ph.; Madar, R. (1 February 1994). "Metallurgical and physical study of praseodymium disilicides and digermanides". Journal of Alloys and Compounds . 204 (1): 251–260. doi:10.1016/0925-8388(94)90100-7. ISSN   0925-8388 . Retrieved 3 July 2025.
  4. ↑ Haynes, William M. (4 June 2014). CRC Handbook of Chemistry and Physics. CRC Press. pp. 4–84. ISBN   978-1-4822-0868-9 . Retrieved 3 July 2025.
  5. ↑ Donnay, Joseph Désiré Hubert (1963). Crystal Data; Determinative Tables. American Crystallographic Association. p. 631. Retrieved 3 July 2025.
  6. ↑ Gorbachuk, N. P.; Bolgar, A. S.; Blinder, A. V. (1 September 1997). "Thermodynamic properties of praseodymium silicides in the temperature range 298.15-2257 K". Powder Metallurgy and Metal Ceramics. 36 (9): 498–501. doi:10.1007/BF02680501. ISSN   1573-9066 . Retrieved 3 July 2025.
  7. ↑ de la Venta, J.; Basaran, Ali C.; Grant, T.; Gallardo-Amores, J. M.; Ramirez, J. G.; Alario-Franco, M. A.; Fisk, Z.; Schuller, Ivan K. (1 August 2013). "Magnetism and the absence of superconductivity in the praseodymium–silicon system doped with carbon and boron". Journal of Magnetism and Magnetic Materials . 340: 27–31. Bibcode:2013JMMM..340...27D. doi:10.1016/j.jmmm.2013.03.018. ISSN   0304-8853 . Retrieved 3 July 2025.
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