Tellurium oxide Property

Melting point:

733°C

Density 

5.67

solubility 

insoluble in H2O

form 

yellow-orange crystals

color 

yellow-orange crystals, crystalline

Crystal Structure

VF3 type

crystal system

Three sides

Space group

R3c

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.4896	0.4896	1.3022	90	90	120	0.2703

CAS DataBase Reference

13451-18-8

EPA Substance Registry System

Tellurium oxide (TeO3) (13451-18-8)

Safety

RIDADR 

1479

HazardClass 

5.1

PackingGroup 

II

Hazard and Precautionary Statements (GHS)

Tellurium oxide Chemical Properties,Usage,Production

Description

Tellurium oxide is a general term for the binary compounds of oxygen and tellurium, commonly known as tellurium oxide TeO and tellurium dioxide TeO2, tellurium pentoxide Te2O5 and tellurium trioxide TeO3. Among these four oxides, tellurium oxide is basic, tellurium dioxide is amphoteric, and tellurium pentoxide and tellurium trioxide are acidic. Tellurium oxide is a gray-black solid, and its presence indicates that tellurium is more metallic than sulfur and selenium. Tellurium dioxide is a non-volatile white solid with a relative density of 5.67, a melting point of 733°C, a boiling point of 1245°C, and is toxic! Difficult to dissolve in water, can dissolve in sodium hydroxide to generate sodium tellurite, with nitric acid acidification there are white flakes of tellurite H2TeO3 precipitation. Tellurium dioxide can be reduced to tellurium monomers by hydrogen when heated.

Chemical Properties

-60 mesh with 99.9% purity; two forms: yellowish orange α, and grayish β; αis a strong oxidant, e.g. reacting vigorously with Al, Sn, C, P and S [KIR83] [CER91]

Uses

Tellurium oxide is used in the preparation of tellurites, emission spectroscopy, and electronic component materials.It is also used as a brightener in electroplating solutions, as a catalyst for oil cracking, and as a colorant for ceramics and glass.

Synthesis

Tellurium trioxide, β-TeO3, is formed via thermal decomposition of Te(OH)6.