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THALLIUM (I) OXIDE

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THALLIUM (I) OXIDE Basic information

Product Name:
THALLIUM (I) OXIDE
Synonyms:
  • THALLIUM(+1)OXIDE
  • THALLIUM (I) OXIDE
  • Thallous oxide
  • THALLIUM(OUS) OXIDE
  • Thallium monooxide
  • THALLIUM MONOXIDE
  • THALLIUM OXIDE
  • dithalliumoxide
CAS:
1314-12-1
MF:
OTl2
MW:
424.76
EINECS:
215-220-4
Mol File:
1314-12-1.mol
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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]
Crystal Structure
Reverse CdCl2 type
crystal system
Three sides
Space group
R3m
Lattice constant
a/nmb/nmc/nmα/oβ/oγ/oV/nm3
0.35160.35163.78490901200.4051
CAS DataBase Reference
1314-12-1
EPA Substance Registry System
Thallium oxide (Tl2O) (1314-12-1)
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Safety Information

RIDADR 
1707
HazardClass 
6.1(a)
PackingGroup 
II
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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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