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  | Green 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 green crystalline solid or powder.[2] It reacts violently with water (even on contact with air) and is toxic via ingestion, inhalation and skin absorption.[3] It has a hexagonal structure.[1]

## Synthesis

Potassium phosphide can be synthesised by a reaction under controlled conditions starting from the two elements. Simply fusing potassium and phorsphorus does not yield pure K3P:[4]

12 K + P
4 → 4 K

## 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. Bibcode: 2010JPED...31...68S.
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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Phosphides

| PH3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | He

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Li3P | Be |  |  |  |  |  |  |  |  |  |  | BP | CP | N | O | F | Ne
Na3P | Mg |  |  |  |  |  |  |  |  |  |  | AlP | Si | P | S | Cl | Ar
K3P | Ca3P2
CaP | ScP | TiP | V | CrP
Cr3P | Mn | Fe2P | CoP
Co2P
Co3P2 | NixPy | Cu3P | Zn3P2 | GaP | Ge | As | Se | Br | Kr
Rb | Sr | YP | ZrP
ZrP2 | Nb | MoP
MoP2 | Tc | Ru2P | Rh | Pd | Ag3P | Cd | InP
GaInP2 | Sn | SbP | Te | I | Xe
Cs3P | Ba | *  | Hf | Ta | W | Re | OsP2 | Ir | Pt | Au | Hg | Tl | PbP7 | BiP | Po | At | Rn
Fr | Ra | **  | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og
|  | ↓ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| * | LaP | CeP | Pr | Nd | Pm | Sm | EuP | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu |
| ** | AcP | Th | Pa | UP | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No | Lr |

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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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