URANIUM(VI) OXIDE Property

Melting point:

°Cd ec.)

Density 

7,29 g/cm³

solubility 

insoluble in H2O; soluble in acid solutions

form 

orange-yellow crystals

color 

orange-yellow crystals, crystalline

Water Solubility 

insoluble H2O; soluble acids [MER06]

crystal system

Nogata

Space group

Fddd

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.9787	1.9932	0.9705	90	90	90	1.8932

EPA Substance Registry System

Uranium trioxide (1344-58-7)

Safety

RIDADR 

2912

HazardClass 

7

HS Code 

28441000

Hazard and Precautionary Statements (GHS)

URANIUM(VI) OXIDE Chemical Properties,Usage,Production

Chemical Properties

-100 mesh; has six forms: α is hexagonal brown, β is orange monoclinic, γ is bright yellow rhomb, δ is red cub, ε is brick red tricl, ηis rhomb; UO3 can be obtained by thermal decomposition of uranyl compounds, e.g, carbonates, oxalates nitrates [KIR83] [CER91]

Chemical Properties

Uranium trioxide has been isolated in six well-defined stoichiometric modifications as well as a hypostoichiometric modification, UO2. Similar to U3O8, the trioxide decomposes into lower oxides prior to melting or subliming. Even though UO3 is formally U(VI), a small temperature-dependent paramagnetism exists with molar magnetic susceptibility values ranging from 128 to 157×10?6 cm3/mol. A general trend has been observed for the densities of uranium oxides; an inverse proportionality between the O/U ratio and the density of the material. The trioxide does not deviate from this trend with density values ranging from 6.99 to 8.54 g/cm3, depending on the modification.

Uses

Uranium trioxide, UO3, is a versatile solid that has important applications in the nuclear fuel cycle.

Synthesis

Pure UO3 is difficult to prepare because the thermal cleavage of uranyl compounds does not free the product of traces of volatile components, while at high temperatures dissociation into U3O8 and O2 becomes objectionable. To circumvent these drawbacks it is desirable to use O2 at a pressure above atmospheric.
A weighing tube is charged with 5-10 g. of the dry peroxide and placed (unstoppered) in an electric crucible furnace preheated to 350°C. A fast stream of O2 is admitted through the opening in the furnace lid. The temperature is initially held for 3-5 hours at 350°C and then for one half to one hour at 400°C. The weighing tube is then stoppered and allowed to cool in a desiccator.

Purification Methods

The oxide is dissolved in HClO4 (to give a uranium content of 5%), and the solution is adjusted to pH 2 by addition of dilute ammonia. Dropwise addition of 30% H2O2, with rapid stirring, precipitated U(VI) peroxide, the pH being held constant during the precipitation, by addition of small amounts of the ammonia solution. Then H2O2 is added until further quantities caused no change in pH. After stirring for 1hour, the slurry is filtered through coarse filter paper in a Büchner funnel, washed with 1% H2O2 acidified to pH 2 with HClO4, then heated at 350o for three days in a large platinum dish [Baes J Phys Chem 60 878 1956].