Oxides and oxygen compounds

Plutonium(VII) compounds

Plutonium(VII) compounds contain plutonium in the +7 oxidation state, the highest confirmed state of the element, known almost entirely from short-lived alkaline solutions that are dark green.

Polyoxometalate water oxidation catalysis

Polyoxometalate water oxidation catalysis is the use of polyoxometalates, anionic metal-oxo clusters of tungsten, molybdenum, or vanadium, to catalyze water oxidation into oxygen, a field begun in 2008 with ruthenium-substituted polyoxotungstates.

Potassium dichromate

Potassium dichromate (K₂Cr₂O₇), also known as kali bichromicum, is an inorganic chromium salt forming orange-red crystals, used as a strong oxidizing agent and primary analytical standard, and restricted in the EU as carcinogenic.

Potassium hydroxide

Potassium hydroxide, also known as caustic potash or potassium lye, is a strongly alkaline inorganic compound used to make soaps, fertilizers, potassium carbonate, and alkaline battery electrolytes.

Potassium oxide

Potassium oxide (K₂O), also called dipotassium oxide, is a white, hygroscopic ionic compound of potassium and oxygen that reacts violently with water to form potassium hydroxide.

Potassium permanganate

Potassium permanganate (KMnO4), also known as Condy's crystals, is a dark purple crystalline salt and strong oxidizing agent used in water treatment and as a mild antiseptic.

Pt1/FeOx single-atom catalyst

Pt1/FeOx is a single-atom catalyst of isolated positively charged platinum atoms on iron oxide, reported in 2011 as the first practical single-atom catalyst, active for CO oxidation.

Rare-earth hydroxides

Rare-earth hydroxides are the hydroxide and oxyhydroxide solid phases of scandium, yttrium, and the lanthanides, whose solubility varies smoothly across the 4f series, enabling classical fractional precipitation separation of the rare earths.

Rust

Rust is the reddish-brown corrosion product that forms on iron and its alloys when both oxygen and water are present; chemically it is hydrated iron(III) oxide.

Ruthenate

Ruthenates are oxide compounds containing ruthenium, oxygen, and one or more other elements, a family spanning the Mott insulator Ca₂RuO₄, the superconducting Sr₂RuO₄, and catalytically active pyrochlores.

Ruthenium(IV) oxide

Ruthenium(IV) oxide, or ruthenium dioxide (RuO₂), is a black, metallically conductive crystalline oxide with the rutile structure and the most stable oxide of ruthenium, known for catalyzing oxygen and chlorine evolution and for use in supercapacitors.

Silver oxide

Silver oxide most commonly refers to silver(I) oxide (Ag₂O), a dark, light-sensitive solid that is the principal oxide of silver and the cathode of 1.55 V button cells.

Singlet oxygen

Singlet oxygen is molecular oxygen in an excited singlet state rather than its ordinary triplet ground state, a short-lived reactive oxidant that damages DNA and lipids and drives photodynamic therapy.

Soda

Soda, in trade known as soda ash and historically as washing soda, is sodium carbonate, an alkali refined from trona and used chiefly in glassmaking.

Sodium carbonate

Sodium carbonate (Na2CO3), also known as soda ash or washing soda, is an inorganic salt refined from trona or made synthetically, and is used mainly as a flux in glassmaking.

Sodium hydroxide

Sodium hydroxide (NaOH), also known as caustic soda, is a white, corrosive solid and one of the most widely produced industrial bases, used in papermaking and soap.

Sodium nitrite

Sodium nitrite (NaNO2) is the sodium salt of nitrous acid, a white crystalline oxidizer used as a preservative and color fixative in cured meats and as a cyanide-poisoning antidote.

Sodium oxide

Sodium oxide (Na2O), also called sodium monoxide, is a white, strongly basic ionic solid that reacts violently with water and is a key component of soda-lime glass.

Sodium perborate

Sodium perborate, sold as the monohydrate and tetrahydrate, is a white crystalline peroxide salt that releases hydrogen peroxide in water, serving as the bleach in laundry detergents.

Sodium percarbonate

Sodium percarbonate, also called sodium carbonate peroxyhydrate (过碳酸钠), is a crystalline adduct of sodium carbonate and hydrogen peroxide used mainly as the oxygen-bleaching agent in laundry detergents.

Sodium periodate

Sodium periodate, also called sodium metaperiodate, is the sodium salt NaIO₄ of periodate, a white crystalline oxidizing agent that cleaves vicinal diols in the Malaprade reaction.

Sodium tungstate

Sodium tungstate is an inorganic sodium salt of tungstic acid with the formula Na₂WO₄, a white, highly water-soluble crystalline solid that serves as the key intermediate in tungsten metallurgy.

Sr3Ir2O7

Sr3Ir2O7, known as strontium iridate, is a bilayered perovskite iridate studied as a candidate spin-orbit Mott insulator; it orders antiferromagnetically along the c axis at 285 K.

SrIrO3

SrIrO3, strontium iridate, is a 5d transition-metal oxide, the n = ∞ end member of the Ruddlesden–Popper iridate series, a paramagnetic semimetal and Dirac nodal-line semimetal studied for correlated topological states.

SrIrO3 perovskite

SrIrO3 perovskite is a strontium iridium oxide, more than ten times more active than IrO2 for acidic oxygen evolution, whose surface reconstructs into catalytically active amorphous IrOx.

Strontium oxide

Strontium oxide, also called strontia or strontium monoxide, is the strongly basic oxide of strontium, a grayish-white ionic solid used chiefly as a glass modifier and fluxing agent.

Studtite

Studtite is a secondary uranium mineral, first described in 1947 at Shinkolobwe, that forms where radiolysis-produced hydrogen peroxide meets uranyl ions, including on spent nuclear fuel.

Superoxide

Superoxide, also written O₂•⁻, is the radical anion of oxygen formed when a single electron is added to molecular oxygen, occurring in salts like potassium superoxide and in cells.

Tellurium dioxide

Tellurium dioxide (TeO₂) is the +4 oxide of tellurium, a white crystalline solid found as the minerals paratellurite and tellurite. Its single crystals are a leading acousto-optic material.