Chemistry:Praseodymium disilicide
| Names | |
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| IUPAC name
bis(λ2-silanylidene)praseodymium
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| Other names
Praseodymium silicide, praseodymium(II) silicide
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| Identifiers | |
3D model (JSmol)
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| PrSi2 | |
| Molar mass | 197.078 g·mol−1 |
| Appearance | Dark 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). | |
| Infobox references | |
Praseodymium disilicide is a binary inorganic compound of praseodymium and silicon with the chemical formula PrSi
2.[1][2]
Synthesis
Fusion of stoichiometric amounts of pure substances:[1]
- Pr + 2Si → PrSi
2
- Pr + 2Si → PrSi
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 PrSi
1.8).[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
- ↑ 1.0 1.1 1.2 "Praseodymium Disilicide Powder, PrSi2, CAS 12066-83-0 - Heeger Mate..." (in en-us). Heeger Materials Inc.. https://heegermaterials.com/silicide-powder/2967-praseodymium-disilicide-powder-prsi2-cas-12066-83-0.html.
- ↑ "Praseodymium Silicide | CAS 12066-83-0 | PrSi2 | AMERICAN ELEMENTS" (in en). American Elements. https://www.americanelements.com/praseodymium-silicide-12066-83-0.
- ↑ 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. https://www.sciencedirect.com/science/article/abs/pii/0925838894901007. Retrieved 3 July 2025.
- ↑ Haynes, William M. (4 June 2014) (in en). CRC Handbook of Chemistry and Physics. CRC Press. pp. 4–84. ISBN 978-1-4822-0868-9. https://books.google.com/books?id=bNDMBQAAQBAJ&dq=Praseodymium+disilicide&pg=SA4-PA84. Retrieved 3 July 2025.
- ↑ Donnay, Joseph Désiré Hubert (1963) (in en). Crystal Data; Determinative Tables. American Crystallographic Association. p. 631. https://books.google.com/books?id=x5ghAQAAMAAJ&dq=Praseodymium+disilicide&pg=PA631. Retrieved 3 July 2025.
- ↑ 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" (in en). Powder Metallurgy and Metal Ceramics 36 (9): 498–501. doi:10.1007/BF02680501. ISSN 1573-9066. https://link.springer.com/article/10.1007/BF02680501. Retrieved 3 July 2025.
- ↑ 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. doi:10.1016/j.jmmm.2013.03.018. ISSN 0304-8853. Bibcode: 2013JMMM..340...27D. https://www.sciencedirect.com/science/article/abs/pii/S0304885313001868. Retrieved 3 July 2025.
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