Chemistry:Cadmium phosphide
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| Other names
Tricadmium diphosphide
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3D model (JSmol)
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CompTox Dashboard (EPA)
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| Properties | |
| Cd3P2 | |
| Molar mass | 399.178 g/mol |
| Appearance | bluish white[1] or gray[2] |
| Density | 5.96 g/cm3[1] |
| Melting point | 700[1] °C (1,292 °F; 973 K) |
| Electron mobility | 1500 cm2/Vs[1] |
Refractive index (nD)
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3.88[1] |
| Structure | |
| Tetragonal | |
| Hazards | |
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| GHS Signal word | Warning |
| H302, H312, H314, H332, H350, H370, H410 | |
| P201, P202, P210, P233, P261, P264, P270, P271, P273, P280, P301+312, P302+352, P304+340, P308+313, P312, P330, P362+364Script error: No such module "Preview warning".Category:GHS errors, P391, P405, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Cadmium phosphide (Cd3P2) is an inorganic chemical compound. It is a grey or white bluish solid semiconductor material with a bandgap of 0.5 eV.[1] It has applications as a pesticide, material for laser diodes and for high-power-high-frequency electronics.[1]
Synthesis and reactions
Cadmium phosphide can be prepared by the reaction of cadmium with phosphorus:
- 6 Cd + P4 → 2 Cd3P2
Structure
Cd3P2 has a room-temperature tetragonal form.
The crystalline structure of cadmium phosphide is very similar to that of zinc phosphide (Zn3P2), cadmium arsenide (Cd3As2) and zinc arsenide (Zn3As2). These compounds of the Zn-Cd-P-As quaternary system exhibit full continuous solid-solution.[3]
Applications
Over the last decade, interest in cadmium phosphide as a source for fast, near-IR emission has grown due to the development of cadmium phosphide quantum dots. Literature has demonstrated that these quantum dots possess tunable emission between 700 nm to 1500 nm.[4][5] A recent paper investigated the effect of surface passivation on these quantum dots and showed that cadmium phosphide quantum dots may have an intrinsic band-edge relaxation time less than 100 ns.[6]
Safety
Like other metal phosphides, it is acutely toxic when swallowed due to the formation of phosphine gas when it reacts with gastric acid. It is also carcinogenic and dangerous for the skin, eyes and other organs in a large part due to cadmium poisoning.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "Cadmium Phosphide (Cd3P2) Semiconductors". 2013-08-19. https://www.azom.com/article.aspx?ArticleID=8413.
- ↑ Ramsay, William (1891) (in en). A System of Inorganic Chemistry. J. & A. Churchill. p. 551. https://books.google.com/books?id=Ix5DAAAAIAAJ&pg=PA551.
- ↑ Trukhan, V. M.; Izotov, A. D.; Shoukavaya, T. V. (2014). "Compounds and solid solutions of the Zn-Cd-P-As system in semiconductor electronics". Inorganic Materials 50 (9): 868–873. doi:10.1134/S0020168514090143.
- ↑ Miao, S.; Hickey, S. G.; Rellinghaus, B.; Waurisch, C.; Eychmuller, A. (2010). "Synthesis and Characterization of Cadmium Phosphide Quantum Dots Emitting in the Visible Red to Near-Infrared". Journal of the American Chemical Society 132 (16): 5613–5615. doi:10.1021/ja9105732. PMID 20361738.
- ↑ Xie, R.; Zhang, J.; Yang, W.; Peng, X. (2010). "Synthesis of Monodisperse, Highly Emissive, and Size-Tunable Cd3P2 Nanocrystals". Chemistry of Materials 22 (13): 3820–3822. doi:10.1021/cm1008653.
- ↑ Smith, L.; Harbison, K. E.; Diroll, B. T.; Fedin, I. (2023). "Acceleration of Near-IR Emission through Efficient Surface Passivation in Cd3P2 Quantum Dots". Materials 16 (19): 6346. doi:10.3390/ma16196346. PMID 37834483.
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