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Aluminium phosphide

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Aluminium phosphide
Aluminium phosphide tablets
Crystal structure
Names
Other names
Aluminum phosphide
Aluminium(III) phosphide
Aluminium monophosphide
Phostoxin
Fumitoxin
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.040.065
EC Number
  • 244-088-0
PubChem CID
RTECS number
  • BD1400000
UNII
UN number 1397 3048
  • InChI=1S/Al.P checkY
    Key: PPNXXZIBFHTHDM-UHFFFAOYSA-N checkY
  • InChI=1/Al.P/rAlP/c1-2
    Key: PPNXXZIBFHTHDM-LQQCNYPFAR
  • [PH+]12[Al-][PH+]3[Al-][PH+]([AlH-]14)[AlH-]1[P+]5([AlH-]38)[Al-]26[PH+]2[AlH-]([P+]4)[PH+]1[Al-][PH+]3[AlH-]2[P+][AlH-]([PH+]6[AlH-]([PH+])[PH+]68)[PH+]([Al-]6)[AlH-]35
Properties
AlP
Molar mass 57.9552 g/mol
Appearance Yellow or gray crystals
Odor garlic-like
Density 2.85 g/cm3
Melting point 2,530 °C (4,590 °F; 2,800 K)
reacts
Band gap 2.5 eV (indirect)
2.75 (IR), ~3 (Vis)
Structure
Zincblende
T2d-F43m
a = 546.35 pm
Tetrahedral
Thermochemistry
Std molar
entropy
(S298)
47.3 J/mol K
-164.4 kJ/mol
Hazards
GHS labelling:
GHS02: FlammableGHS06: ToxicGHS09: Environmental hazard
Danger
H260, H300, H311, H330, H400
P223, P231+P232, P260, P264, P270, P271, P273, P280, P284, P301+P310, P302+P352, P304+P340, P310, P312, P320, P321, P322, P330, P335+P334, P361, P363, P370+P378, P391, P402+P404, P403+P233, P405, P501
NFPA 704 (fire diamond)
4
1
2
Flash point > 800 °C (1,470 °F; 1,070 K)
Lethal dose or concentration (LD, LC):
11.5 mg/kg
Safety data sheet (SDS) External MSDS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Aluminium phosphide is a highly toxic inorganic compound with the chemical formula AlP, used as a wide band gap semiconductor and a fumigant. This colorless solid is generally sold as a grey-green-yellow powder due to the presence of impurities arising from hydrolysis and oxidation.

Properties

AlP crystals are dark grey to dark yellow in color and have a zincblende crystal structure with a lattice constant of 5.4510 Å at 300 K. They are thermodynamically stable up to 1,000 °C (1,830 °F).

Aluminium phosphide reacts with water or acids to release phosphine:

AlP + 3 H2O → Al(OH)3 + PH3
AlP + 3 H+ → Al3+ + PH3

This reaction is the basis of its toxicity.

Preparation

AlP is synthesized by combination of the elements:

4Al + P4 → 4AlP

Caution must be taken to avoid exposing the AlP to any sources of moisture, as this generates toxic phosphine gas. Phosphine also poses fire hazards, as it is a dangerous pyrophoric compound, igniting easily in air.

Uses

Pesticide

AlP is used as a rodenticide, insecticide, and fumigant for stored cereal grains. It is used to kill small verminous mammals such as moles and rodents. The tablets or pellets, known as "wheat pills", typically also contain other chemicals that evolve ammonia and carbon dioxide (e.g. ammonium carbamate), which help to reduce the potential for spontaneous ignition or explosion of the phosphine gas.

AlP is used as both a fumigant and an oral pesticide. As a rodenticide, aluminium phosphide pellets are provided as a mixture with food for consumption by the rodents. The acid in the digestive system of the rodent reacts with the phosphide to generate the toxic phosphine gas. Other pesticides similar to aluminium phosphide are zinc phosphide and calcium phosphide. In this application, aluminium phosphide can be encountered under various brand names, e.g. PestPhos,Quickphos, Celphos, Fostox, Fumitoxin, Phostek, Phostoxin, Talunex, Fieldphos, and Weevil-Cide. It generates phosphine gas according to the following hydrolysis equation.

2 AlP + 6 H2O → Al2O3∙3 H2O + 2 PH3

It is used as a fumigant when other pesticide applications are impractical and when structures and installations are being treated, such as in ships, aircraft, and grain silos. All of these structures can be effectively sealed or enclosed in a gastight membrane, thereby containing and concentrating the phosphine fumes. Fumigants are also applied directly to rodent burrows.

Semiconductor applications

Industrially, AlP is a semiconductor material that is usually alloyed with other binary materials for applications in devices such as light-emitting diodes (e.g. aluminium gallium indium phosphide).

Toxicology

Highly poisonous, aluminium phosphide has been used for suicide. Fumigation has also caused unintentional deaths. Known as "rice tablet" in Iran, for its use to preserve rice, there have been frequent incidents of accidental or intentional death. There is a campaign by the Iranian Forensic Medicine Organization to stop its use as a pesticide.

Recycling of used aluminium phosphide containers caused the death of three family members in Alcalá de Guadaira, Spain. They had been keeping them in plastic sacks in their bathroom. The deaths occurred accidentally due to aluminium phosphide reacting with water or moisture, and becoming phosphine, leading to their death within hours.

Aluminium phosphide poisoning is considered a wide-scale problem in the Indian subcontinent.


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