THALLIUM (I) OXIDE Chemical Properties

Melting point:

about 300°

Boiling point:

1080℃ [HAW93]

Density 

9.520

solubility 

soluble in H2O, ethanol

form 

black rhombohedral crystals

color 

black rhomb crystals, crystalline; hygroscopic

Water Solubility 

soluble H2O, hydrolyzes to hydroxide; soluble alcohol [MER06]

CAS DataBase Reference

1314-12-1

EPA Substance Registry System

Thallium oxide (Tl2O) (1314-12-1)

Safety Information

RIDADR 

1707

HazardClass 

6.1(a)

PackingGroup 

II

THALLIUM (I) OXIDE Usage And Synthesis

Reaction

Thallium oxide slowly oxidizes to thallic oxide, Tl2O3 on exposure to air, gradually becoming insoluble in aqueous solution.

Physical properties

Thallium monooxide is a black powder; orthorhombic crystals; hygroscopic; density 9.52g/cm3; melts at 596°C; vaporizes at about 1,080°C; soluble in water, alcohol and acids.

Uses

In manufacture of glass of a high coefficient of refraction for optical purposes (thallium flint glass) and for artificial gems.

Preparation

Thallium oxide can be made by heating Tl metal in air or oxygen. The brown-black thallic oxide, Tl₂O₃ , that may also form begins to lose oxygen at about 100°C converting to thallium oxide, Tl₂O.
Thallium oxide also can be prepared by thermal dissociation of thallium hydroxide, TlOH or thallium carbonate, Tl₂CO₃ Thallium oxide dissolves in water forming thallous hydroxide, TlOH. It reacts with carbon dioxide to form thallous carbonate, Tl2CO3.

Hazard

Toxic by ingestion.

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