magnesium selenide Property

Density 

4.21

solubility 

reacts with H2O

form 

brown cubic crystals

color 

brown cubic crystals, crystalline

Water Solubility 

decomposes in H2O [MER06]

EPA Substance Registry System

Magnesium selenide (MgSe) (1313-04-8)

Safety

RIDADR 

3288

HazardClass 

6.1(b)

PackingGroup 

III

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H226Flammable liquid and vapour

H315Causes skin irritation

H319Causes serious eye irritation

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.

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

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

P271Use only outdoors or in a well-ventilated area.

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.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

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

P337+P313IF eye irritation persists: Get medical advice/attention.

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

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

magnesium selenide Chemical Properties,Usage,Production

Description

Magnesium selenide has the molecular formula of MgSe and the molecular weight of 103.2652 g/mol. It is a stable, light gray to brown crystalline powder with a refractive index, πD=2.44. Its density is 4.21 g/cm³ and it decomposes in water:
MgSe+ 2H2O ? Mg(OH)2+H2Se
Thus, it cannot be prepared by bubbling H2Se gas through a soluble Mg²⁺ aqueous solution. MgSe can be prepared by a variety of other methods. Among the easiest are the reaction of magnesium oxide and selenium. Alternately, the two elements can be reacted together to form the selenide:
MgO(solid)+ Se(solid)+ heat ? MgSe(solid)+ SeO2(gas)
Mg(solid)+ Se(solid)+ heat ? MgSe(solid)
In the first reaction, Se melts at 225°C while the MgO is stable. Selenium dioxide sublimes at 320°C. The reaction is carried out in an inert atmosphere at about 550°C. If a tube furnace is used, crystals of SeO2 appear at the cool end of the tube. In the second reaction, an inert atmosphere is mandatory and the reaction temperature is also 550°C (which is below the melting point of Mg metal).
Magnesium selenide has the CAS number of 1313- 04-8. It is not stable in air and reacts with moisture to form H2Se, a foul-smelling and toxic gas:
MgSe+H2O ? Mg(OH)2 +H2Se

Chemical Properties

light brown powder(s); unstable in air [MER06]