Chemistry:Strontium disilicide
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| Other names
Strontium silicide, strontium(II) silicide
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3D model (JSmol)
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| Properties | |
| Si2Sr | |
| Molar mass | 143.79 g·mol−1 |
| Appearance | silver-gray crystals[1] |
| Density | 3.35 g/cm3 |
| Melting point | 1,100 °C (2,010 °F; 1,370 K) |
| reacts with water | |
| Structure | |
| Cubic | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Strontium disilicide is a binary inorganic compound of strontium and silicon with the chemical formula SrSi
2.[2][3]
Synthesis
Synthesis of strontium disilicide can be by fusion of strontium oxide or strontium carbonate with silicon, or silicon oxide and with coal:[4]
- SrO + 2Si + С → SrSi
2 + CO - SrCO
3 + 2SiO
2 + 4C → SrSi
2 + 4CO + CO
2
- SrO + 2Si + С → SrSi
Physical properties
Strontium disilicide forms silver-gray crystals of the cubic system,[5] space group P4132.[6] The unit cell parameters are a = 6.540 Å. The density is measured at 3.40 kg/l but based on the unit cell size, it should be 3.43 kg/l. The silicon atoms form a three-dimensional lattice with the smallest Si-Si distance being 2.41 Å which is slightly more than in solid silicon. Si-Si-Si angles ∠ are 113.03°. Each silicon atom connects to three other silicon atoms. Eight silicon atoms surround each strontium atom, six at 3.21 Å and two at 3.43 Å.[7]
Chemical properties
Water decomposes the compound:[8]
- SrSi
2 + 6H
2O → Sr(OH)
2 + 2SiO
2 + 5H
2
- SrSi
Also, the compound reacts with mineral acids.
Uses
SrSi
2 is reported to be a narrow-gap semiconductor or even a Weyl semimetal, with holes as the dominant charge carriers. The potential applications include thermoelectric devices and other applications where its unique properties can be utilized.[9]
References
- ↑ Lide, David R. (29 June 2004) (in en). CRC Handbook of Chemistry and Physics, 85th Edition. CRC Press. p. 4-87. ISBN 978-0-8493-0485-9. https://books.google.com/books?id=WDll8hA006AC&dq=Strontium+silicide&pg=RA58-SA4-PA87. Retrieved 25 June 2025.
- ↑ Park, Chong Rae (12 March 2019) (in en). Advanced Thermoelectric Materials. John Wiley & Sons. p. 4-90. ISBN 978-1-119-40736-2. https://books.google.com/books?id=zd6MDwAAQBAJ&dq=Strontium+disilicide&pg=SA4-PA110. Retrieved 25 June 2025.
- ↑ (in en) Comprehensive Inorganic Chemistry II: From Elements to Applications. Newnes. 23 July 2013. p. 366. ISBN 978-0-08-096529-1. https://books.google.com/books?id=_4C7oid1kQQC&dq=Strontium+disilicide&pg=RA1-PA366. Retrieved 25 June 2025.
- ↑ Berezhnoĭ, Anatoliĭ Semenovich (1960) (in en). Silicon and Its Binary Systems: Translated from Russian. Consultants Bureau. p. 61. https://books.google.com/books?id=HN_QAAAAMAAJ&q=Strontium+disilicide. Retrieved 25 June 2025.
- ↑ Addison, C. C. (31 October 2007) (in en). Inorganic Chemistry of the Main-Group Elements: Volume 1. Royal Society of Chemistry. p. 226. ISBN 978-1-84755-637-0. https://books.google.com/books?id=SHAoDwAAQBAJ&dq=Strontium+silicide&pg=PA226. Retrieved 25 June 2025.
- ↑ Donnay, Joseph Désiré Hubert (1973) (in en). Crystal Data: Inorganic compounds. National Bureau of Standards. p. C-163. https://books.google.com/books?id=5lVCBwmZsLYC&dq=Strontium+disilicide&pg=RA6-PA163. Retrieved 25 June 2025.
- ↑ Janzon, K.; Schäfer, H.; Weiss, Armin (March 1965). "Crystal Structure of Strontium Disilicide". Angewandte Chemie International Edition in English 4 (3): 245. doi:10.1002/anie.196502452.
- ↑ Worthington, George (1902) (in en). Industrial Engineering. McGraw-Hill Publishing Company. p. 360. https://books.google.com/books?id=1oisSb1l6RcC&q=Strontium+silicide+water. Retrieved 25 June 2025.
- ↑ Singh, Shiva Kumar; Imai, Motoharu (1 December 2020). "Thermoelectric properties of cubic Ba-substituted strontium disilicide, Sr1-xBaxSi2, with Ba content above solid solubility limit". Intermetallics 127. doi:10.1016/j.intermet.2020.106981. ISSN 0966-9795. https://www.sciencedirect.com/science/article/abs/pii/S0966979520308852. Retrieved 25 June 2025.
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