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Thorium dioxide (ThO 2), also called thorium(IV) oxide, is a crystalline solid, often white or yellow in colour. Also known as thoria, it is mainly a by-product of lanthanide and uranium production. [4] Thorianite is the name of the mineralogical form of thorium dioxide. It is moderately rare and crystallizes in an isometric system.
Properties Chemical formula. ThO Molar mass: 248.04 g·mol −1 ... Thorium monoxide (thorium(II) oxide), is the binary oxide of thorium having chemical formula ThO.
Thorium oxide is being replaced in this use with other oxides, such as those of zirconium, cerium, and lanthanum. [156] [157] Thorium dioxide is found in refractory ceramics, such as high-temperature laboratory crucibles, [38] either as the primary ingredient or as an addition to zirconium dioxide.
Thorium reacts with hydrogen to form the thorium hydrides ThH 2 and Th 4 H 15, the latter of which is superconducting below the transition temperature of 7.5–8 K; at standard temperature and pressure, it conducts electricity like a metal. [12] Thorium is the only metallic element that readily forms a hydride higher than MH 3. [31]
This is an extended version of the energy density table from the main Energy density page: Energy densities table Storage type ... Silver-oxide [19] 0.47: 1.8:
Thorianite is a rare thorium oxide mineral, ThO 2. [5] It was originally described by Ananda Coomaraswamy in 1904 as uraninite, [6] but recognized as a new species by Wyndham R. Dunstan. [7] It was so named by Dunstan on account of its high percentage of thorium; it also contains the oxides of uranium, lanthanum, cerium, praseodymium and neodymium.
Thorianite is a rare mineral and may contain up to about 12% thorium oxide. Monazite contains 2.5% thorium, allanite has 0.1 to 2% thorium and zircon can have up to 0.4% thorium. [2] Thorium-containing minerals occur on all continents. [3] [4] [5] Thorium is several times more abundant in Earth's crust than all isotopes of uranium combined and ...
Thorium (IV) nitrate is a ... The density is 2.80 g/cm 3. [4] Vapour pressure of the pentahydrate at 298K is 0.7 torr, ... dimethylamine, and trimethylphosphine oxide