di-BORON TRIOXIDE[B2O3]

·         CAS Number 1303-86-2

·         Linear Formula B₂O₃

·         Molecular Weight 69.61 g/mol

·          EC Number 215-125-8

Boron trioxide (or diboron trioxide) is one of the oxides of boron. It is a white, glassy solid with the formula B₂O₃. It is almost always found as the vitreous (amorphous) form; however, it can be crystallized after extensive annealing (that is, under prolonged heat).

Detailed description

Glassy boron oxide (g-B₂O₃) is thought to be composed of boroxol rings which are six-membered rings composed of alternating 3-coordinate boron and 2-coordinate oxygen. Because of the difficulty of building disordered models at the correct density with a large number of boroxol rings, this view was initially controversial, but such models have recently been constructed and exhibit properties in excellent agreement with experiment.^[6] It is now recognized, from experimental and theoretical studies,^{[7][8][9][10][11]} that the fraction of boron atoms belonging to boroxol rings in glassy B₂O₃ is somewhere between 0.73 and 0.83, with 0.75 ( ³⁄₄) corresponding to a 1:1 ratio between ring and non-ring units.

The crystalline form (α-B₂O₃) (see structure in the infobox^[1]) is exclusively composed of BO₃ triangles. This trigonal, quartz-like network undergoes a coesite-like transformation to monoclinic β-B₂O₃ at several gigapascals (9.5 GPa).

Applications

·         Fluxing agent for glass and enamels

·         Starting material for synthesizing other boron compounds such as boron carbide

·         An additive used in glass fibres (optical fibres)

·         It is used in the production of borosilicate glass

·         The inert capping layer in the Liquid Encapsulation Czochralski process for the production of gallium arsenide single crystal

·         As an acid catalyst in organic synthesis

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