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	{{chembox		{{Chembox
			| Verifiedfields = changed
⚫	| verifiedrevid = 377012344
			| Watchedfields = changed
⚫	| Name = Antimony tetroxide
		⚫	| verifiedrevid = 434226759
	| ImageFile = Sb2O4 structure.jpg
		⚫	| Name = Antimony tetroxide
			| ImageFile1 = Alpha-Sb2O4-xtal-b-2x2x2-3D-bs-17.png
			| ImageCaption1 = ''α''-{{chem2|Sb2O4}}
			| ImageFile2 = Beta-Sb2O4-xtal-b-2x2x2-3D-bs-17.png
			| ImageCaption2 = ''β''-{{chem2|Sb2O4}}<br><br>{{Color box|#bd80e3|border=darkgray}} ] {{Color box|#ee2010|border=darkgray}} ]
	| IUPACName = antimony(III,V) oxide		| IUPACName = antimony(III,V) oxide
	| ImageName =		| ImageName =
	| OtherNames =		| OtherNames =
	| Section1 = {{Chembox Identifiers		|Section1={{Chembox Identifiers
	| CASNo = 12786-74-2		| CASNo = 1332-81-6
			| CASNo_Ref = {{cascite|correct|CAS}}
	| CASOther = 1332-81-6
			| ChemSpiderID = 66628
⚫	}}
			| EINECS = 215-576-0
⚫	| Section2 = {{Chembox Properties
			| UNII_Ref = {{fdacite|correct|FDA}}
⚫	| Formula = SbO<sub>2</sub>; Sb<sub>2</sub>O<sub>4</sub>
			| UNII = XB7RVZ5DN5
⚫	| MolarMass = 153.7588; 307.5176 g/mol
			| PubChem = 74002
⚫	| Appearance = white solid
		⚫	}}
⚫	| Density = 6.64 g/cm<sup>3</sup> (orthorhombic form) <ref name="Amador" />
		⚫	|Section2={{Chembox Properties
⚫	| Solubility = insoluble
		⚫	| Formula = SbO<sub>2</sub>; Sb<sub>2</sub>O<sub>4</sub>
⚫	| MeltingPt = dec.
		⚫	| MolarMass = 153.7588; 307.5176 g/mol
	| BoilingPt = dec.
		⚫	| Appearance = white solid
⚫	| pKa =
		⚫	| Density = 6.64 g/cm<sup>3</sup> (orthorhombic form) <ref name="Amador" />
		⚫	| Solubility = insoluble
		⚫	| MeltingPt = >
			| MeltingPtC = 930
			| MeltingPt_notes = (decomposes)
			| BoilingPt_notes = decomposes
		⚫	| pKa =
	| RefractIndex = 2.0		| RefractIndex = 2.0
	}}		}}
	| Section3 = {{Chembox Structure		|Section3={{Chembox Structure
	| Coordination =		| Coordination =
	| CrystalStruct = ]		| CrystalStruct = ]
	| Dipole =		| Dipole =
	}}		}}
	| Section7 = {{Chembox Hazards		|Section7={{Chembox Hazards
	| ExternalMSDS =		| ExternalSDS =
		⚫	| NFPA-H = 2
	| EUClass =
	| NFPA-R =		| NFPA-F = 1
	| RPhrases =		| NFPA-R = 0
			| REL = TWA 0.5 mg/m<sup>3</sup> (as Sb)<ref name=PGCH>{{PGCH|0036}}</ref>
	| SPhrases =
			| PEL = TWA 0.5 mg/m<sup>3</sup> (as Sb)<ref name=PGCH/>
⚫	| NFPA-H = 2
		⚫	}}
	| NFPA-F = 1
		⚫	|Section8={{Chembox Related
	| NFPA-R = 0
		⚫	| OtherAnions =
⚫	}}
		⚫	| OtherCations =
⚫	| Section8 = {{Chembox Related
		⚫	| OtherCompounds = ]<br />]
⚫	| OtherAnions =
		⚫	}}
⚫	| OtherCations =
⚫	| OtherCpds = ]<br />]
⚫	}}
	}}		}}
	'''Antimony tetroxide''' is an ] with the formula Sb<sub>2</sub>O<sub>4</sub>. This material, which exists as the mineral cervantite,<ref>{{cite web| url = http://webmineral.com/data/Cervantite.shtml| title = Cervantite| accessdate = 2009-06-06| publisher = Webminerals}}</ref> is white but reversibly yellows upon heating. The material, with empirical formula SbO<sub>2</sub>, is called antimony tetroxide to signify the presence of two kinds of Sb centers.		'''Antimony tetroxide''' is an ] with the formula Sb<sub>2</sub>O<sub>4</sub>. This material, which exists as the mineral cervantite,<ref>{{cite web| url = http://webmineral.com/data/Cervantite.shtml| title = Cervantite| access-date = 2009-06-06| publisher = Webminerals}}</ref> is white but reversibly yellows upon heating. The material, with empirical formula SbO<sub>2</sub>, is called antimony tetroxide to signify the presence of two kinds of Sb centers.<ref name="G&E">{{Greenwood&Earnshaw2nd|page=576}}</ref>
	==Formation and structure==		==Formation and structure==
	The material forms when ] is heated in air:<ref>Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.</ref>		The material forms when ] is heated in air:<ref>Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. {{ISBN|0-12-352651-5}}.</ref>
	:Sb<sub>2</sub>O<sub>3</sub> + 0.5 O<sub>2</sub> → Sb<sub>2</sub>O<sub>4</sub> ΔH = −187 kJ/mol		:Sb<sub>2</sub>O<sub>3</sub> + 0.5 O<sub>2</sub> → Sb<sub>2</sub>O<sub>4</sub> ΔH = −187 kJ/mol
	At 800 °C, ] loses oxygen to give the same material:		At 800 °C, ] loses oxygen to give the same material:
	:Sb<sub>2</sub>O<sub>5</sub> → Sb<sub>2</sub>O<sub>4</sub> + 0.5 O<sub>2</sub> ΔH = −64 kJ/mol		:Sb<sub>2</sub>O<sub>5</sub> → Sb<sub>2</sub>O<sub>4</sub> + 0.5 O<sub>2</sub> ΔH = −64 kJ/mol
	The material is mixed valence, containing both Sb(V) and Sb(III) centers. Two ] are known, one orthorhombic (shown in the infobox) and one monoclinic.<ref name="Amador">J. Amador, E. Gutierrez Puebla, M. A. Monge, I. Rasines, and C. Ruiz Valero "Diantimony Tetraoxides Revisited" Inorganic Chemistry 1988, Volume 27, pp. 1367–1370. {{DOI|10.1021/ic00281a011}}</ref> Both forms feature octahedral Sb(V) centers arranged in sheets with distorted Sb(III) centers bound to four oxides.		The material is mixed valence, containing both Sb(V) and Sb(III) centers. Two ] are known, one orthorhombic (shown in the infobox) and one monoclinic.<ref name="Amador">{{cite journal | last1 = Amador | first1 = J. | last2 = Puebla | first2 = E. Gutierrez | last3 = Monge | first3 = M. A. | last4 = Rasines | first4 = I. | last5 = Valero | first5 = C. Ruiz | year = 1988 | title = Diantimony Tetraoxides Revisited | journal = Inorganic Chemistry | volume = 27 | issue = 8 | pages = 1367–1370 | doi = 10.1021/ic00281a011 }}</ref> Both forms feature octahedral Sb(V) centers arranged in sheets with distorted Sb(III) centers bound to four oxides.
	==References==		==References==
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	{{Antimony compounds}}		{{Antimony compounds}}
			{{Oxides}}
	]		]
	]		]
	]		]
	]
	]
	]
	]