A trioxide is a
compound
Compound may refer to:
Architecture and built environments
* Compound (enclosure), a cluster of buildings having a shared purpose, usually inside a fence or wall
** Compound (fortification), a version of the above fortified with defensive struc ...
with three
oxygen
Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as ...
atoms. For metals with the M
2O
3 formula there are several common structures. Al
2O
3, Cr
2O
3, Fe
2O
3, and V
2O
3 adopt the
corundum structure. Many rare earth oxides adopt the "A-type rare earth structure" which is
hexagonal
In geometry, a hexagon (from Greek , , meaning "six", and , , meaning "corner, angle") is a six-sided polygon. The total of the internal angles of any simple (non-self-intersecting) hexagon is 720°.
Regular hexagon
A '' regular hexagon'' has ...
. Several others plus indium oxide adopt the "
C-type rare earth structure", also called "bixbyite", which is
cubic and related to the
fluorite structure In solid state chemistry, the fluorite structure refers to a common motif for compounds with the formula MX2. The X ions occupy the eight tetrahedral interstitial sites whereas M ions occupy the regular sites of a face-centered cubic (FCC) structur ...
.
List of trioxides
MO3
*
Carbon trioxide
Carbon trioxide (CO3) is an unstable oxide of carbon (an oxocarbon). The possible isomers of carbon trioxide include ones with molecular symmetry point groups ''Cs'', ''D3h'', and ''C2v.'' The ''C2v'' state, consisting of a dioxirane, has been ...
, CO
3
*
Chromium trioxide
Chromium trioxide (also known as chromium(VI) oxide or chromic anhydride) is an inorganic compound with the formula CrO3. It is the acidic anhydride of chromic acid, and is sometimes marketed under the same name.
This compound is a dark-purple s ...
, CrO
3
*
Molybdenum trioxide
Molybdenum trioxide describes a family of inorganic compounds with the formula MoO3(H2O)n where n = 0, 1, 2. These compounds are produced on the largest scale of any molybdenum compound. The anhydrous oxide is a precursor to molybdenum metal, an ...
, MoO
3
*
Rhenium trioxide
Rhenium trioxide or rhenium(VI) oxide is an inorganic compound with the formula ReO3. It is a red solid with a metallic lustre that resembles copper in appearance. It is the only stable trioxide of the Group 7 elements ( Mn, Tc, Re).
Prepara ...
, ReO
3
*
Selenium trioxide, SeO
3
*
Sulfur trioxide, SO
3
*
Tellurium trioxide
Tellurium trioxide ( Te O3) is an inorganic chemical compound of tellurium and oxygen. In this compound, tellurium is in the +6 oxidation state
In chemistry, the oxidation state, or oxidation number, is the hypothetical charge of an atom if all ...
, TeO
3
*
Tungsten trioxide
Tungsten(VI) oxide, also known as tungsten trioxide is a chemical compound of oxygen and the transition metal tungsten, with formula WO3. The compound is also called tungstic anhydride, reflecting its relation to tungstic acid . It is a light ...
, WO
3
*
Uranium trioxide
Uranium trioxide (UO3), also called uranyl oxide, uranium(VI) oxide, and uranic oxide, is the hexavalent oxide of uranium. The solid may be obtained by heating uranyl nitrate to 400 °C. Its most commonly encountered polymorph, γ-UO3, is a ...
, UO
3
*
Xenon trioxide
Xenon trioxide is an unstable Noble gas compounds, compound of xenon in its +6 oxidation state. It is a very powerful oxidizing agent, and liberates oxygen from water slowly, accelerated by exposure to sunlight. It is dangerously explosive upon co ...
, XeO
3
M2O3
*
Antimony trioxide, Sb
2O
3
*
Arsenic trioxide
Arsenic trioxide, sold under the brand name Trisenox among others, is an inorganic compound and medication. As an industrial chemical, whose major uses include in the manufacture of wood preservatives, pesticides, and glass. As a medication, it ...
, As
2O
3
*
Bismuth(III) oxide
Bismuth(III) oxide is perhaps the most industrially important compound of bismuth. It is also a common starting point for bismuth chemistry. It is found naturally as the mineral bismite (monoclinic) and sphaerobismoite (tetragonal, much more rare) ...
, Bi
2O
3
*
Boron trioxide
Boron trioxide or diboron trioxide is the oxide of boron with the formula . It is a colorless transparent solid, almost always glassy (amorphous), which can be crystallized only with great difficulty. It is also called boric oxide or boria. It h ...
, B
2O
3
*
Cobalt(III) oxide
Cobalt(III) oxide is the inorganic compound with the formula of Co2O3. Although only two oxides of cobalt are well characterized, CoO and Co3O4, procedures claiming to give Co2O3 have been described. Thus treatment of Co(II) salts such as coba ...
, Co
2O
3
*
Dichlorine trioxide, Cl
2O
3
*
Dinitrogen trioxide
Dinitrogen trioxide is the chemical compound with the formula N2O3. It is one of the simple nitrogen oxides. It forms upon mixing equal parts of nitric oxide and nitrogen dioxide and cooling the mixture below −21 °C (−6 °F):
:NO + ...
, N
2O
3
*
Gadolinium oxide, Gd
2O
3
*
Gallium(III) oxide
Gallium(III) oxide is an inorganic compound and ultra-wide bandgap semiconductor with the formula Ga2 O3. It is actively studied for applications in power electronics, phosphors, and gas sensing. The compound has several polymorphs, of which t ...
, Ga
2O
3
*
Gold trioxide, Au
2O
3
*
Indium(III) oxide
Indium(III) oxide ( In2 O3) is a chemical compound, an amphoteric oxide of indium.
Physical properties
Crystal structure
Amorphous indium oxide is insoluble in water but soluble in acids, whereas crystalline indium oxide is insoluble in both wat ...
, In
2O
3
*
Iron(III) oxide, Fe
2O
3
*
Manganese(III) oxide, Mn
2O
3
*
Nickel(III) oxide, Ni
2O
3
*
Phosphorus trioxide
Phosphorus trioxide is the chemical compound with the molecular formula P4O6. Although the molecular formula suggests the name tetraphosphorus hexaoxide, the name phosphorus trioxide preceded the knowledge of the compound's molecular structure, a ...
, P
4O
6 (named before the true formula known)
*
Thallium(III) oxide, Tl
2O
3
*
Terbium(III) oxide
Terbium(III) oxide, also known as terbium sesquioxide, is a sesquioxide of the rare earth metal terbium, having chemical formula . It is a p-type semiconductor, which conducts protons, which is enhanced when doped with calcium. It may be prepared ...
, Tb
2O
3
*
Trioxidane
Trioxidane (systematically named μ-trioxidanediidodihydrogen), also called dihydrogen trioxide, is an inorganic compound with the chemical formula (can be written as or ). It is one of the unstable hydrogen polyoxides. In aqueous solutions, ...
, H
2O
3
*
Vanadium trioxide, V
2O
3
*
Ytterbium(III) oxide
Ytterbium(III) oxide is the chemical compound with the formula Yb2O3. It is one of the more commonly encountered compounds of ytterbium. It has the "rare-earth C-type sesquioxide" structure which is related to the fluorite structure with one quart ...
, Yb
2O
3
*
Yttrium(III) oxide
Yttrium oxide, also known as yttria, is Y2 O3. It is an air-stable, white solid substance.
The thermal conductivity of yttrium oxide is 27 W/(m·K).
Uses Phosphors
Yttria is widely used to make Eu:YVO4 and Eu:Y2O3 phosphors that give the red ...
, Y
2O
3
Other trioxides
*
Mineral trioxide aggregate
Mineral trioxide aggregate (MTA) was developed for use as a dental root repair material by Mahmoud Torabinejad. It is formulated from commercial Portland cement, combined with bismuth oxide powder for radio-opacity. MTA is used for creating apical ...
*
Sulfur trioxide pyridine complex, SO
3(py)
References
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