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Name	Uranium(IV) oxide	EINECS	215-700-3
CAS No.	1344-57-6	Density	g/cm³
PSA	34.14000	LogP	-0.23760
Solubility	N/A	Melting Point	2500oC
Formula	O2U	Boiling Point	°Cat760mmHg
Molecular Weight	270.028	Flash Point	°C
Transport Information	N/A	Appearance	N/A
Safety	A radioactive material. It ignites spontaneously in heated air and burns brilliantly. See also URANIUM.	Risk Codes	R26/28; R33; R51/53
Molecular Structure		Hazard Symbols	High radiation risk. Ignites spontaneously in finely divided form.
Synonyms	C.I. 77915;Urania; Urania (UO2); Uranium dioxide; Uranium oxide; Uranium(4+) dioxide;Uranium(IV) oxide; g-Uranium dioxide	Article Data	9

Uranium(IV) oxide Synthetic route

: uranium

: 201230-82-2
carbon monoxide

A: 1344-57-6
uranium dioxide

B: 12035-97-1
uranium monoxide

C: 151265-41-7
CUO(CO)

D: 318953-41-2
UO2CO

E: 12069-98-6
CUO

Conditions

Conditions	Yield
In solid matrix codeposition of U atoms, Ar and CO onto a cold substrate at 10 K;; not isolated; detn. by IR spectroscopy;;

...Expand

: uranium

: 124-38-9
carbon dioxide

A: 1344-57-6
uranium dioxide

B: 12035-97-1
uranium monoxide

C: 151269-72-6
OUCO

D: 318953-41-2
UO2CO

E: 151269-73-7
OU(CO)2

Conditions

Conditions	Yield
In solid matrix byproducts: CO; codeposition of U atoms, Ar and CO2 onto a cold substrate at 10 K;; not isolated; detn. by IR spectroscopy;;

...Expand

: C112H162Cl2Li2N10P6Si6U2

: 100-52-7
benzaldehyde

A: 1344-57-6
uranium dioxide

B: C38H44N2P2Si2

C: C23H25PSi

Conditions

Conditions	Yield
In benzene-d6 at 20℃; for 1h; Inert atmosphere;

: C47H57ClN2P3Si3U(1-)*C18H36N2O6*Li(1+)

: 100-52-7
benzaldehyde

A: 1344-57-6
uranium dioxide

B: C38H44N2P2Si2

C: C23H25PSi

Conditions

Conditions	Yield
In benzene-d6 at 20℃; for 0.5h; Inert atmosphere;

: C61H77N6P3Si3U

: 100-52-7
benzaldehyde

A: 1344-57-6
uranium dioxide

B: C38H44N2P2Si2

C: C23H25PSi

Conditions

Conditions	Yield
In benzene-d6 at 20℃; for 12h; Inert atmosphere;

: C112H162Cl2Li2N10P6Si6U2

: 642-31-9
9-anthracene aldehyde

A: 1344-57-6
uranium dioxide

B: 1282040-50-9
C46H48N2P2Si2

C: C31H29PSi

Conditions

Conditions	Yield
In benzene-d6 at 20℃; for 1h; Inert atmosphere;

: C47H57ClN2P3Si3U(1-)*C18H36N2O6*Li(1+)

: 642-31-9
9-anthracene aldehyde

A: 1344-57-6
uranium dioxide

B: 1282040-50-9
C46H48N2P2Si2

C: C31H29PSi

Conditions

Conditions	Yield
In benzene-d6 at 20℃; for 12h; Inert atmosphere;

: C61H77N6P3Si3U

: 642-31-9
9-anthracene aldehyde

A: 1344-57-6
uranium dioxide

B: 1282040-50-9
C46H48N2P2Si2

C: C31H29PSi

Conditions

Conditions	Yield
In benzene-d6 at 20℃; for 16h; Inert atmosphere;

: uranium oxide

: 1344-57-6
uranium dioxide

Conditions

Conditions	Yield
at 650℃; for 18h; Inert atmosphere;

: uranium(IV) aspartate

: 7732-18-5
water

: 1344-57-6
uranium dioxide

Conditions

Conditions	Yield
at 160℃; for 30h; Time; Autoclave; High pressure;

Uranium(IV) oxide Chemical Properties

IUPAC Name: Dioxouranium
CAS: 1344-57-6
EINECS: 215-700-3
Following is the Molecular Structure of Uranium(iv) oxide (1344-57-6):

SMILES: O=[U]=O
InChI: InChI=1/2O.U/rO2U/c1-3-2
InChIKey: FCTBKIHDJGHPPO-YEMCAWSEAK
Std.InChI: InChI=1S/2O.U
Std.InChIKey: FCTBKIHDJGHPPO-UHFFFAOYSA-N
Molecular Formula: O₂U
Molecular Weight: 270.03
Melting Point: 2865℃
Density: 10.97g/cm³

Uranium(IV) oxide Uses

Uranium(iv) oxide (1344-57-6) is used mainly as nuclear fuel,specifically as UO₂ or as a mixture of UO₂ and PuO₂ ( Plutonium dioxide ) called a mixed oxide (MOX fuel) for fuel rods in nuclear reactors.

Uranium(IV) oxide Safety Profile

Hazard Codes: T+ Very Toxic, N Dangerous for the environment.
Risk Statements: 26/28-33-51/53
R26/28: Very Toxic by inhalation and if swallowed.
R33: Danger of cumulative effects.
R51/53: Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements: 20/21-45-61
S20/21: When using, do not eat, drink or smoke.
S45: In case of accident or if you feel unwell, seek medical advice immediately (show label where possible).
S61: Avoid release to the environment. Refer to special instructions safety data sheet.
RIDADR: 2912
HazardClass: 7
PackingGroup: III
A radioactive material. It ignites spontaneously in heated air and burns brilliantly.

Uranium(IV) oxide Specification

Uranium(iv) oxide (1344-57-6) also can be called for Uranium dioxide ; Uranium(IV) oxide ; Uranium oxide brown-black ; Uranium oxide ; UO₂; Uranium oxide(UO₂) ; Uranium(4) oxide,red ; Uraniumoxide(UO₂) . Uranium(iv) oxide (1344-57-6) is an oxide of Uranium ,and is a black, radioactive, crystalline powder that naturally occurs in the mineral Uraninite . Uranium(iv) oxide (1344-57-6) is a semiconductor material. Its band gap is about 1.3 eV, which lies between the band gap for Silicon and Gallium arsenide , near the optimum for efficiency vs band gap curve for absorption of solar radiation, suggesting its possible use for very efficient solar cells based on Schottky diode structure; it also absorbs at five different wavelengths, including infrared, further enhancing its efficiency. Its intrinsic conductivity at room temperature is about the same as of single crystal Silicon .

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