# Trioxide

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{{Short description|Compound with three oxygen atoms}}
{{For|the triple-oxygen-molecule existing in the atmosphere|Ozone}}
A '''trioxide''' is a [compound](/source/chemical_compound) with three [oxygen](/source/oxygen) atoms.  For metals with the M<sub>2</sub>O<sub>3</sub> formula there are several common structures.  Al<sub>2</sub>O<sub>3</sub>, Cr<sub>2</sub>O<sub>3</sub>, Fe<sub>2</sub>O<sub>3</sub>, and V<sub>2</sub>O<sub>3</sub> adopt the [corundum structure](/source/corundum_structure).  Many rare earth oxides adopt the "A-type rare earth structure" which is [hexagonal](/source/hexagonal).  Several others plus indium oxide adopt the "[C-type rare earth structure](/source/C-type_rare_earth_structure)", also called "bixbyite", which is [cubic](/source/cubic_crystal_system) and related to the [fluorite structure](/source/fluorite_structure).<ref name=Jaffe>{{cite book|last=Jaffe|first=Howard W.|title=Crystal Chemistry and Refractivity|year=1996|publisher=Courier Dover Publications|isbn=978-0-486-69173-2|pages=266–272|url=https://books.google.com/books?id=lbxUYhC5YEEC&dq=bixbyite+crystal+structure&pg=PA274|access-date=2021-12-05|archive-date=2023-09-08|archive-url=https://web.archive.org/web/20230908040812/https://books.google.com/books?id=lbxUYhC5YEEC&dq=bixbyite+crystal+structure&pg=PA274|url-status=live}}</ref>

==List of trioxides==
<!-- To do: make a wikitable with more info (structure at least) -->
===MO<sub>3</sub>===

*[Carbon trioxide](/source/Carbon_trioxide), CO<sub>3</sub>
*[Chromium trioxide](/source/Chromium_trioxide), CrO<sub>3</sub>
*[Molybdenum trioxide](/source/Molybdenum_trioxide), MoO<sub>3</sub>
*[Rhenium trioxide](/source/Rhenium_trioxide), ReO<sub>3</sub>
*[Selenium trioxide](/source/Selenium_trioxide), SeO<sub>3</sub>
*[Sulfur trioxide](/source/Sulfur_trioxide), SO<sub>3</sub>
*[Tellurium trioxide](/source/Tellurium_trioxide), TeO<sub>3</sub>
*[Tungsten trioxide](/source/Tungsten_trioxide), WO<sub>3</sub>
*[Uranium trioxide](/source/Uranium_trioxide), UO<sub>3</sub>
*[Xenon trioxide](/source/Xenon_trioxide), XeO<sub>3</sub>

===M<sub>2</sub>O<sub>3</sub>===

*[Antimony trioxide](/source/Antimony_trioxide), Sb<sub>2</sub>O<sub>3</sub>
*[Arsenic trioxide](/source/Arsenic_trioxide), As<sub>2</sub>O<sub>3</sub>
*[Bismuth(III) oxide](/source/Bismuth(III)_oxide), Bi<sub>2</sub>O<sub>3</sub>
*[Boron trioxide](/source/Boron_trioxide), B<sub>2</sub>O<sub>3</sub>
*[Cobalt(III) oxide](/source/Cobalt(III)_oxide), Co<sub>2</sub>O<sub>3</sub>
*[Dichlorine trioxide](/source/Dichlorine_trioxide), Cl<sub>2</sub>O<sub>3</sub>
*[Dinitrogen trioxide](/source/Dinitrogen_trioxide), N<sub>2</sub>O<sub>3</sub>
*[Gadolinium oxide](/source/Gadolinium_oxide), Gd<sub>2</sub>O<sub>3</sub>
*[Gallium(III) oxide](/source/Gallium(III)_oxide), Ga<sub>2</sub>O<sub>3</sub>
*[Gold trioxide](/source/Gold_trioxide), Au<sub>2</sub>O<sub>3</sub> 
*[Indium(III) oxide](/source/Indium(III)_oxide), In<sub>2</sub>O<sub>3</sub>
*[Iron(III) oxide](/source/Iron(III)_oxide), Fe<sub>2</sub>O<sub>3</sub> 
*[Manganese(III) oxide](/source/Manganese(III)_oxide), Mn<sub>2</sub>O<sub>3</sub> 
*[Nickel(III) oxide](/source/Nickel(III)_oxide), Ni<sub>2</sub>O<sub>3</sub>
*[Phosphorus trioxide](/source/Phosphorus_trioxide), P<sub>4</sub>O<sub>6</sub> (named before the true formula known)
*[Thallium(III) oxide](/source/Thallium(III)_oxide), Tl<sub>2</sub>O<sub>3</sub>
*[Terbium(III) oxide](/source/Terbium(III)_oxide), Tb<sub>2</sub>O<sub>3</sub> 
*[Trioxidane](/source/Trioxidane), H<sub>2</sub>O<sub>3</sub>
*[Vanadium trioxide](/source/Vanadium_trioxide), V<sub>2</sub>O<sub>3</sub>
*[Ytterbium(III) oxide](/source/Ytterbium(III)_oxide), Yb<sub>2</sub>O<sub>3</sub> 
*[Yttrium(III) oxide](/source/Yttrium(III)_oxide), Y<sub>2</sub>O<sub>3</sub>

===Other trioxides===

*[Mineral trioxide aggregate](/source/Mineral_trioxide_aggregate) 
*[Sulfur trioxide pyridine complex](/source/Sulfur_trioxide_pyridine_complex), SO<sub>3</sub>(py)

==References==

{{reflist}}

Category:Oxides

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