A trioxide is a
compound 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 we ...
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
Cubic may refer to:
Science and mathematics
* Cube (algebra), "cubic" measurement
* Cube, a three-dimensional solid object bounded by six square faces, facets or sides, with three meeting at each vertex
** Cubic crystal system, a crystal system w ...
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) struct ...
.
List of trioxides
MO3
*
Carbon trioxide, 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 ...
, 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, a ...
, MoO
3
*
Rhenium trioxide, ReO
3
*
Selenium trioxide, SeO
3
*
Sulfur trioxide, SO
3
*
Tellurium trioxide, 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, XeO
3
M2O3
*
Antimony trioxide
Antimony(III) oxide is the inorganic compound with the formula Sb2O3. It is the most important commercial compound of antimony. It is found in nature as the minerals valentinite and senarmontite. Like most polymeric oxides, Sb2O3 dissolves i ...
, 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, i ...
, As
2O
3
*
Bismuth(III) oxide, Bi
2O
3
*
Boron trioxide, B
2O
3
*
Cobalt(III) oxide, Co
2O
3
*
Dichlorine trioxide
Dichlorine trioxide, Cl2O3, is a chlorine oxide. It is a dark brown solid discovered in 1967 which is explosive even below 0 °C. It is formed by the low-temperature photolysis of ClO2 and is formed along with Cl2O6, Cl2 and O2. Its struct ...
, 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
Gadolinium(III) oxide (archaically gadolinia) is an inorganic compound with the formula Gd2O3. It is one of the most commonly available forms of the rare-earth element gadolinium, derivatives of which are potential contrast agents for magnetic r ...
, 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, In
2O
3
*
Iron(III) oxide
Iron(III) oxide or ferric oxide is the inorganic compound with the formula Fe2O3. It is one of the three main oxides of iron, the other two being iron(II) oxide (FeO), which is rare; and iron(II,III) oxide (Fe3O4), which also occurs naturally ...
, 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
Thallium(III) oxide, also known as thallic oxide, is a chemical compound of thallium and oxygen. It occurs in nature as the rare mineral avicennite. Its structure is related to that of Mn2O3 which has a bixbyite like structure. Tl2O3 is metallic ...
, 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 prepare ...
, Tb
2O
3
*
Trioxidane, H
2O
3
*
Vanadium trioxide
Vanadium(III) oxide is the inorganic compound with the formula V2O3. It is a black solid prepared by reduction of V2O5 with hydrogen or carbon monoxide. It is a basic oxide dissolving in acids to give solutions of vanadium (III) complexes. V2O ...
, 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
*
Sulfur trioxide pyridine complex
Sulfur trioxide pyridine complex is the compound with the formula C5H5NSO3. It is a colourless solid that dissolves in polar organic solvents. It is the adduct formed from the Lewis base pyridine and the Lewis acid sulfur trioxide. The compound ...
, SO
3(py)
References
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