Thallium(III) oxide

Dithalliumtrioxid

Brown to black solid

Fixed

10.11 g · cm -3

717 ° C

875 ° C.

Insoluble in water

Risk

44 mg · kg -1 ( LD50, rat, oral)

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Thallium ( III) oxide is a chemical compound selected from the group of oxides of thallium.

Occurrence

Thallium (III ) oxide occurs naturally in the form of the very rare mineral Avicennit.

Production and representation

Thallium ( III) oxide can be prepared by reaction of thallium ( I) nitrate with potassium hydroxide and chlorine are produced, wherein the case is produced reddish brown thallium (III ) oxide hydrate with the approximate composition Tl2O3 • 1.47 H 2 O, by which the Vakuumexsikkation anhydrous form can be converted.

Properties

Thallium (III ) oxide is a brown to black (depending on presentation conditions ) solid which is insoluble in water. He has a defect structure of calcium fluoride - type (a = 10.543 A). About 500 ° C and 65 kbar it assumes a crystal structure of corundum type. In contrast to " isoelectronic " lead (IV ) oxide is thallium ( III) oxide only moderate oxidizer and decays at a relatively high temperature to thallium ( I) oxide and oxygen.