STRONTIUM ARSENIDE Property

EPA Substance Registry System

Strontium arsenide (Sr3As2) (39297-24-0)

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H226Flammable liquid and vapour

H301Toxic if swalloed

H315Causes skin irritation

H318Causes serious eye damage

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P233Keep container tightly closed.

P240Ground/bond container and receiving equipment.

P241Use explosion-proof electrical/ventilating/lighting/…/equipment.

P242Use only non-sparking tools.

P243Take precautionary measures against static discharge.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P270Do not eat, drink or smoke when using this product.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P332+P313IF SKIN irritation occurs: Get medical advice/attention.

P370+P378In case of fire: Use … for extinction.

P403+P235Store in a well-ventilated place. Keep cool.

P405Store locked up.

P501Dispose of contents/container to..…

STRONTIUM ARSENIDE Chemical Properties,Usage,Production

Description

Strontium Arsenide, Sr3As2, may be prepared by the reaction of the elements or by the reduction of strontium arsenate. The latter method is best accomplished by rapidly heating with carbon to 1500 to 1600 °C. If the heating is slow, reduction begins at about 800 °C yielding first the arsenite, arsenic then being lost and strontium oxide formed:
3Sr + 2As + heat ? Sr3As2
2Sr3AsO4 + 4C + heat ? Sr3As2 + 3SrO + 3CO + CO2
Strontium arsenide forms reddish-brown crystals, transparent in thin sections, with a density of 3.23 g/ cm3. It has the CAS number 39297-24-0. Its molecular weight is 1167.9668 g/mol. It decomposes in contact with water, forming strontium hydroxide with liberation of arsine. It burns brilliantly when heated in oxygen or sulfur vapor. It reacts with fluorine at room temperature with incandescence and formation of arsenic trifluoride. Similar reactions occur with chlorine at 160°C, with bromine at 200 °C, and with iodine vapor at a higher temperature. It is a powerful reducing agent and attacks most metallic oxides and oxidizing agents. It is considered as a “Dangerous Substance for the Environment” and is prohibited in Europe by the EEC.