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Potassium phosphide
	; Crystal structure of potassium phosphide (K3P)
Names
	Other names Tripotassium;phosphanide; Tripotassium;phosphorus(3-); Tripotassium phosphide;
Identifiers
CAS Number	20770-41-6;
3D model (JSmol)	Interactive image;
ChemSpider	11219118;
ECHA InfoCard	100.040.004
EC Number	244-021-5;
PubChem CID	22182308;
UNII	2F09226A2C;
CompTox Dashboard (EPA)	DTXSID6066652;
	InChI InChI=1S/3K.P/q3*+1;-3 Key: YCIITCDBMPCIPR-UHFFFAOYSA-N;
	SMILES [P-3].[K+].[K+].[K+];
Properties
Chemical formula	K3P
Molar mass	148.269 g mol−1
Appearance	White crystalline solid or powder
Thermochemistry
Std molar; entropy (S⦵298)	49.8 J mol−1 K−1
Std enthalpy of; formation (ΔfH⦵298)	-1.77 kJ mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Potassium phosphide is an inorganic semiconductor compound with the formula K₃P. It appears as a white crystalline solid or powder.^[2] It reacts violently with water and is toxic via ingestion, inhalation and skin absorption.^[3] It has a hexagonal structure.^[1]

Synthesis

Potassium phosphide can be synthesised by simply reacting the two elements together:^[4]

{\ce {12K + P4 -> 4K3P}}

Applications

Potassium phosphide is used in high power, high frequency applications and also in laser diodes.^[2]

References

^ ^a ^b Sangster, James M. (2010-02-01). "K-P (Potassium-Phosphorus) System". Journal of Phase Equilibria and Diffusion. 31 (1): 68–72. doi:10.1007/s11669-009-9614-y. ISSN 1863-7345. S2CID 95780373.
^ ^a ^b Elements, American. "Potassium Phosphide". American Elements. Retrieved 2022-08-29.
^ "POTASSIUM PHOSPHIDE | CAMEO Chemicals | NOAA". cameochemicals.noaa.gov. Retrieved 2022-08-29.
^ Gnutzmann, Geert; Wilhelm Dorn, Friedrich; Klemm, Wilhelm (1961). "Das Verhalten der Alkalimetalle zu Halbmetallen. VII. Über einige A3B- und AB2-Verbindungen der schweren Alkalimetalle mit Elementen der V. Gruppe". Zeitschrift für anorganische und allgemeine Chemie (in German). 309 (3–4): 210–225. doi:10.1002/zaac.19613090308. ISSN 0044-2313.

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[Sangster-1] Sangster, James M. (2010-02-01). "K-P (Potassium-Phosphorus) System". Journal of Phase Equilibria and Diffusion. 31 (1): 68–72. doi:10.1007/s11669-009-9614-y. ISSN 1863-7345. S2CID 95780373.

[AE-2] Elements, American. "Potassium Phosphide". American Elements. Retrieved 2022-08-29.

[3] "POTASSIUM PHOSPHIDE | CAMEO Chemicals | NOAA". cameochemicals.noaa.gov. Retrieved 2022-08-29.

[4] Gnutzmann, Geert; Wilhelm Dorn, Friedrich; Klemm, Wilhelm (1961). "Das Verhalten der Alkalimetalle zu Halbmetallen. VII. Über einige A3B- und AB2-Verbindungen der schweren Alkalimetalle mit Elementen der V. Gruppe". Zeitschrift für anorganische und allgemeine Chemie (in German). 309 (3–4): 210–225. doi:10.1002/zaac.19613090308. ISSN 0044-2313.

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