|Molar mass||57.9552 g/mol|
|Appearance||Yellow or gray crystals|
|Melting point||2,530 °C (4,590 °F; 2,800 K)|
|Band gap||2.5 eV (indirect)|
Refractive index (nD)
|2.75 (IR), ~3 (Vis) |
|Lattice constant||a = 546.35 pm|
|47.3 J/mol K|
Std enthalpy of
|EU classification|| T
|Flash point||> 800 °C (1,470 °F; 1,070 K)|
LD50 (Median lethal dose)
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
Aluminium phosphide (aluminum 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.
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).
- AlP + 3 H2O → Al(OH)3 + PH3
- AlP + 3 H+ → Al3+ + PH3
- 4Al + P4 → 4AlP
Caution must be taken to avoid exposing the AlP to any sources of moisture, as this generates toxic phosphine gas.
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 which helps 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. Celphos, Fumitoxin, Phostoxin, Talunex and Quick Phos. 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.
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).
Evidently poisonous, aluminium phosphide has been used for suicide. Fumigation has also caused unintentional deaths, such as examples in Saudi Arabia and the United States. 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 plastic bottle caps containing aluminium phosphide 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 aluminum phosphide reacting with water or moisture, and becoming phosphine, leading to their death within hours.
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