Uranium dioxide | SSHADE

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Solid phase

Official name: Uranium dioxide

Name and identifiers

Secondary names: Uranium(IV) oxide; dioxouranium; Urania; Uranous oxide
CAS number: 1344-57-6

Family: ionic solid
Class: alkali salt
Compound type: oxide

Chemical composition

Formula: $U^{4+}O^{2-}_2$
Chemical formula: UO2
Elemental formula: (U) (O2-)2
Isotope mixture type: terrestrial abundance

6.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$U^{4+}$	Uranium cation	element	1	0.3333333333333333	1	constituent cation	main
	$O^{2-}$	Oxide anion	element	2	0.6666666666666666	1	constituent anion	main

Chemical functions and bonds

Chemical bonds

	Bond	Number
	$\cdot (\cdot) (\cdot) U^{4+} \cdot O^{2-} \cdot$	8

Class: alkali salts (06)
Type: simple alkali salts (06.01)

Crystallography

Phase type: crystalline
Crystal system: isometric (cubic)
Crystal class: hexoctahedral
Crystal class symbol: m-3m (Oh)
Crystal spacegroup: Fm-3m

Physical properties

Molar mass: 270.028 $g/mol$
Density: 10.97 $g/cm^3$

Thermodynamical properties

State NTP

solid

Phase transitions

Phase transition type	Other phases	Temperature - Pressure
solid-liquid	liquid UO2	2865 °C (3138 K)

Optical properties

Refringence type: isotropic
Pure color: black
Color: black

Links and Publications

Links

Wikipedia: Uranium dioxide