Metal oxides and hydroxides

Akaganeite

Akaganeite is an iron oxyhydroxide mineral with chloride in its tunnels, named for the Akagané mine in Japan and known as a destructive steel corrosion product.

Alkali metal peroxides

Alkali metal peroxides are ionic compounds of the group 1 metals containing the peroxide anion O₂²⁻, powerful oxidizers used to scrub carbon dioxide from air in submarines.

Alkali-metal suboxides

Alkali-metal suboxides are metal-rich oxides of rubidium and cesium, built from ionic Rb₉O₂ and Cs₁₁O₃ clusters in a metallic matrix and classified as metallic electrides.

Alkaline earth metal peroxides

Alkaline earth metal peroxides are salts of the group 2 metals with formula XO2, stable for calcium, strontium, and barium; calcium peroxide releases oxygen slowly for remediation.

Aluminium hydroxide

Aluminium hydroxide, also known as aluminum hydroxide gel or algeldrate, is a white insoluble solid occurring as the mineral gibbsite, used to make alumina and as an antacid and vaccine adjuvant.

Aluminium oxide

Aluminium oxide (Al2O3), commonly called alumina, occurs naturally as corundum, the mineral behind ruby and sapphire, and serves as the feedstock for nearly all aluminum metal production.

Oct 20, 2026

Ammonium hydroxyde (ammonium hydroxide, aqua ammonia, aqueous ammonia, E 527) is ammonia dissolved in water, NH4OH, CAS 1336-21-6; a weakly basic corrosive solution used as fertilizer, cleaner, water-treatment chloramine source, and food additive.

Antimony Trioxide

Antimony trioxide (Sb2O3) is an odorless white crystalline powder, the most commercially significant form of antimony, used mainly as a synergist for halogenated flame retardants in plastics and textiles.

Barium hydroxide

Barium hydroxide, also known as barium hydrate, is a white, strongly basic, water-soluble solid sold chiefly as its octahydrate and used in barium soaps and greases.

Oct 21, 2026

Barium nitrate

Barium nitrate (Ba(NO3)2, CAS 10022-31-8), also called barium dinitrate, is a white crystalline soluble barium salt and strong oxidizer used for green pyrotechnic fire, signal lights, barium oxide, and detonators; toxic via hypokalemia.

Barium oxide

Barium oxide (BaO), also called baryta, is a highly alkaline white powder that reacts violently with water and is used as a drying agent and cathode coating.

Barium peroxide

Barium peroxide (BaO2) is an inorganic peroxide of barium, a grayish-white powder and strong oxidizing agent that was the working chemical of the Brin process for industrial oxygen.

Bayerite

Bayerite (バイエル石) is a rare monoclinic aluminum hydroxide mineral with the formula Al(OH)₃, named in 1928 for metallurgist Karl Josef Bayer and first found naturally in the Hatrurim Formation, Israel.

Beryllium oxide

Beryllium oxide, also called beryllia, is a white crystalline compound of beryllium and oxygen, notable for high thermal conductivity, strong electrical insulation, and use as a neutron moderator in nuclear reactors.

Bismuth vanadate

Bismuth vanadate (BiVO4) is an n-type semiconductor oxide photocatalyst with a bandgap of about 2.4 eV that absorbs visible light and serves as a photoanode in water splitting and degradation of organic pollutants.

Boehmite

Boehmite is an aluminum oxide hydroxide mineral, one of the three principal aluminum-bearing minerals of bauxite, and a source of alumina used in catalysts and flame retardants.

Ca3Mn2O7

Ca3Mn2O7, tricalcium dimanganese heptaoxide, is a layered Ruddlesden–Popper perovskite in which hybrid improper ferroelectricity was first proposed in 2011; its weak ferromagnetism appears below 112 K.

Cadmium oxide

Cadmium oxide (CdO) is an inorganic compound of cadmium and oxygen, appearing as brown crystals or powder, used in electroplating and as a transparent conducting oxide.

Calcium hydroxide

Calcium hydroxide, also called slaked lime, is a white powder made by adding water to quicklime, used in construction, water treatment, food processing, and dentistry.

Calcium manganite

Calcium manganite, or calcium manganate (CaMnO₃), is a perovskite oxide of calcium and manganese, an antiferromagnetic insulator at room temperature and the parent compound of n-type oxide thermoelectric materials.

Calcium oxide

Calcium oxide (CaO), commonly known as quicklime, burnt lime, or unslaked lime, is a white solid made by heating limestone, used chiefly in steelmaking and in water treatment.

Calcium titanate

Calcium titanate (CaTiO3) is an inorganic compound occurring naturally as the mineral perovskite, named after Lev Perovski and discovered in the Ural Mountains in 1839.

Cerium(IV) oxide

Cerium(IV) oxide, also called cerium dioxide or ceria (CeO₂), is a pale yellow-white oxide of cerium best known as the oxygen-storage component of automotive exhaust catalysts and as the standard polishing agent for glass.

Chromate and dichromate

Chromate and dichromate, the yellow and orange oxyanions of hexavalent chromium, interconvert in a pH-dependent equilibrium and serve industrially as oxidants and corrosion inhibitors, though all are carcinogenic.

Chromic acid

Chromic acid (H2CrO4) is a strong acid and powerful oxidizing agent of hexavalent chromium, best known for oxidizing alcohols in organic chemistry and for chromium electroplating baths.

Chromium trioxide

Chromium trioxide (chromium(VI) oxide, chromic anhydride; CrO₃) is a dark red crystalline compound that is a strong oxidizer and the feedstock for chrome plating baths.

Chromium(III) oxide

Chromium(III) oxide (Cr2O3), also called chromia or chromium sesquioxide, is an inorganic compound best known as the green pigment chromium oxide green and as the protective scale on chromium alloys.

Cobalt hydroxide

Cobalt hydroxide, or cobalt(II) hydroxide (Co(OH)₂), is an inorganic compound occurring in blue-green α and reddish β forms, used as a precursor to lithium-ion battery cathode materials.

Cobalt oxide

Cobalt oxide is a family of cobalt–oxygen compounds, mainly cobalt(II) oxide (CoO) and cobalt(II,III) oxide (Co₃O₄), traded as gray and black oxide for pigments, ceramics, glass, and battery cathodes.