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Boron trioxide or diboron trioxide is the oxide of boron with the formula B 2 O 3. It is a colorless transparent solid, almost always glassy (amorphous), which can be crystallized only with great difficulty.
Guitar slide made of borosilicate glass. Borosilicate glass is a type of glass with silica and boron trioxide as the main glass-forming constituents. Borosilicate glasses are known for having very low coefficients of thermal expansion (≈3 × 10 −6 K −1 at 20 °C), making them more resistant to thermal shock than any other common glass.
[16] [17] [18] However, some of its behaviour towards some chemical reactions suggest it to be a tribasic acid in the Brønsted-Lowry sense as well. Boric acid, mixed with borax Na 2 B 4 O 7 ·10H 2 O (more properly Na 2 B 4 O 5 (OH) 4 ·8H 2 O ) in the weight ratio of 4:5, is highly soluble in water, though they are not so soluble separately.
Often the boron in borides has fractional oxidation states, such as −1/3 in calcium hexaboride (CaB 6). From the structural perspective, the most distinctive chemical compounds of boron are the hydrides. Included in this series are the cluster compounds dodecaborate (B 12 H 2− 12), decaborane (B 10 H 14), and the carboranes such as C 2 B 10 ...
Boron oxide may refer to one of several oxides of boron: Boron trioxide (B 2 O 3, diboron trioxide), the most common form;
For example, boron trifluoride (BF 3) combines eagerly with fluoride sources to give the tetrafluoroborate anion, BF 4 −. Boron trifluoride is used in the petrochemical industry as a catalyst. The halides react with water to form boric acid. [51] Other boron halides include those with B-B bonding, such as B 2 F 4 and B 4 Cl 4. [55]
These reactions can also be initiated photochemically by UV radiation in the compounds absorption range at about 230 nm. [3] [4] [5] B(N 3) 3 → BN 3 + 3 N 2 B(N 3) 3 → BN + 4 N 2. In contact with water, it undergoes hydrolysis to hydrazoic acid and boron trioxide. [3] 2 B(N 3) 3 + 3 H 2 O → 6 HN 3 + B 2 O 3
Water-reactive substances [1] are those that spontaneously undergo a chemical reaction with water, often noted as generating flammable gas. [2] Some are highly reducing in nature. [ 3 ] Notable examples include alkali metals , lithium through caesium , and alkaline earth metals , magnesium through barium .