Zinc diphosphide

Zinc diphosphide
Identifiers
CAS Number	12037-79-5;
3D model (JSmol)	Interactive image;
ChemSpider	141421;
EC Number	234-867-3;
	InChI InChI=1S/P2.Zn/c1-2;/q-2;+2 Key: WHCVAYNMVBDLCU-UHFFFAOYSA-N;
	SMILES [P-]=[P-].[Zn+2];
Properties
Chemical formula	ZnP2
Molar mass	127.33 g/mol
Appearance	red crystals
Density	3.53 g/cm3
Melting point	1,040 °C (1,900 °F; 1,310 K)
Structure
Crystal structure	Tetragonal, tP24
Space group	P41212, No. 92[1]
Hazards
GHS pictograms
GHS Signal word	Danger
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Zinc diphosphide (Zn P₂) is an inorganic chemical compound. It is a red semiconductor solid with a band gap of 2.1 eV.[2] It is one of the two compounds in the zinc-phosphorus system, the other being zinc phosphide (Zn₃P₂).

Synthesis and reactions

Zinc diphosphide can be prepared by the reaction of zinc with phosphorus.

Zn + 2 P → ZnP₂

Structure

ZnP₂ has a room-temperature tetragonal form that converts to a monoclinic form at around 990°C.[3] In both of these forms, there are chains of P atoms, helical in the tetragonal, semi-spiral in the monoclinic.[4]

This compound is part of the Zn-Cd-P-As quaternary system and exhibit partial solid-solution with other binary compounds of the system.[5]

Safety

ZnP₂, like Zn₃P₂, is highly toxic due to the release of phosphine gas when the material reacts with gastric acid.

References

Litvinchuk, A. P.; Valakh, M. Ya. "Raman and infrared phonons in tetragonal ZnP2 and CdP2 crystals: A density functional study". Journal of Physics Condensed Matter. 32 (44). doi:10.1088/1361-648X/aba720.
Hegyi, I. J.; Loebner, E. E.; Poor (Jr.), E. W.; White, J. G. (1963). "Two crystal forms of ZnP2, their preparation, structure, and optoelectronic properties". Journal of Physics and Chemistry of Solids. 24: 333–337.
Ghasemi, M.; Stutz, E. Z.; Escobar Steinvall, S.; Zamani, M.; Fontcuberta i Morral, A. "Thermodynamic re-assessment of the Zn–P binary system". Materialia. 6: 100301. doi:10.1016/j.mtla.2019.100301.
Hans Georg von Schnering and Wolfgang Hönle, 1994, Phosphides: Solid State Chemistry, Encyclopedia of Inorganic chemistry, Ed. R Bruce King, John Wiley and Sons, ISBN 0-471-93620-0
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.

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[JPC-1] Litvinchuk, A. P.; Valakh, M. Ya. "Raman and infrared phonons in tetragonal ZnP2 and CdP2 crystals: A density functional study". Journal of Physics Condensed Matter. 32 (44). doi:10.1088/1361-648X/aba720.

[JPCS-2] Hegyi, I. J.; Loebner, E. E.; Poor (Jr.), E. W.; White, J. G. (1963). "Two crystal forms of ZnP2, their preparation, structure, and optoelectronic properties". Journal of Physics and Chemistry of Solids. 24: 333–337.

[Materialia-3] Ghasemi, M.; Stutz, E. Z.; Escobar Steinvall, S.; Zamani, M.; Fontcuberta i Morral, A. "Thermodynamic re-assessment of the Zn–P binary system". Materialia. 6: 100301. doi:10.1016/j.mtla.2019.100301.

[4] Hans Georg von Schnering and Wolfgang Hönle, 1994, Phosphides: Solid State Chemistry, Encyclopedia of Inorganic chemistry, Ed. R Bruce King, John Wiley and Sons, ISBN 0-471-93620-0

[Trukhan-5] 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.