Urantrioxid

Bezeichnung:Urantrioxid

CAS-Nr1344-58-7

Englisch Name:URANIUM(VI) OXIDE

CBNumberCB6362445

SummenformelO3U

Molgewicht286.03

MOL-Datei1344-58-7.mol

Synonyma

Urantrioxid

Urantrioxid physikalisch-chemischer Eigenschaften

Schmelzpunkt	°Cd ec.)
Dichte	7,29 g/cm³
Löslichkeit	insoluble in H2O; soluble in acid solutions
Aggregatzustand	orange-yellow crystals
Farbe	orange-yellow crystals, crystalline
Wasserlöslichkeit	insoluble H2O; soluble acids [MER06]
EPA chemische Informationen	Uranium trioxide (1344-58-7)

Sicherheit

RIDADR	2912
HazardClass	7
HS Code	28441000

URANIUM(VI) OXIDE Chemische Eigenschaften,Einsatz,Produktion Methoden

Chemische Eigenschaften
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.
Chemische Eigenschaften
-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]
Verwenden
Uranium trioxide, UO3, is a versatile solid that has important applications in the nuclear fuel cycle.
läuterung methode
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].

URANIUM(VI) OXIDE Upstream-Materialien And Downstream Produkte

Urantrioxid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

1344-58-7, URANIUM(VI) OXIDE Verwandte Suche:

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