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

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[1]

Std molar
entropy (S ~~o~~ 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]

[math]\ce{ 12K + P4 -> 4K3P }[/math]

## Applications

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

## References

1. ↑ 1.0 1.1 Sangster, James M. (2010-02-01). "K-P (Potassium-Phosphorus) System" (in en). Journal of Phase Equilibria and Diffusion 31 (1): 68–72. doi:10.1007/s11669-009-9614-y. ISSN 1863-7345. https://doi.org/10.1007/s11669-009-9614-y.
2. ↑ 2.0 2.1 Elements, American. "Potassium Phosphide" (in en). https://www.americanelements.com/potassium-phosphide-20770-41-6.
3. ↑ "POTASSIUM PHOSPHIDE | CAMEO Chemicals | NOAA". https://cameochemicals.noaa.gov/chemical/4327.
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" (in de). Zeitschrift für anorganische und allgemeine Chemie 309 (3–4): 210–225. doi:10.1002/zaac.19613090308. ISSN 0044-2313. https://onlinelibrary.wiley.com/doi/10.1002/zaac.19613090308.

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Potassium compounds

* KAsO2
* KBr
* KBrO3
* KCN
* KCNO
* KCl
* KClO
* KClO3
* KClO4
* KF
* KH
* KHCO2
* KHCO3
* KHF2
* KHS
* KHSO3
* KHSO4
* KH2AsO4
* KH2PO3
* KH2PO4
* KI
* KIO3
* KIO4
* KMnO4
* KNH2
* KN3
* K3N
* KNO2
* KNO3
* KOCN
* KOH
* KO2
* KPF6
* KSCN
* KCH3COO
* K2Al2O4
* K2CO3
* K2CrO4
* K2Cr2O7
* K2FeO4
* K2HPO4
* K2MnO4
* K2O
* K2O2
* K2PtCl4
* K2PtCl6
* K2S
* K2SeO4
* K2SO3
* K2SO4
* KHSO5
* K2S2O5
* K2S2O7
* K2S2O8
* K2Po
* K2SiO3
* K3[Fe(CN)6]
* K3[Fe(C2O4)3]
* K4[Fe(CN)6]
* K3PO4
* K4Mo2Cl8

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