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Yingkou Liaobin Fine Chemical Co., Ltd.

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Structure properties of boron oxide

2021-07-22 09:47:48
a

Glassy boron oxide (g-B2O3) is likely to be a network structure composed of many triangular BO3 units connected in an orderly manner through shared oxygen atoms. Among them, the six-membered ring B3O3 with a boron-oxygen phase is dominant. In this six-membered ring, the boron atom is three-coordinated, and the oxygen atom is two-coordinated. The glass body softens at 325-450 °C, and its density varies with heating. When heated, the degree of disorder in the boron oxide structure of the glass body increases. When it exceeds 450 °C, a sexual -B=O group will be produced. Above 1000 °C, boron oxide vapor is composed of B2O3 monomer, and its structure is angular O=B-O-B=O.


Under normal pressure, liquid boron oxide is crystallized in the range of 200-250 °C, and ordinary hexagonal boron oxide (α-B2O3) can be formed, and its structure is almost composed of triangular BO3 units.

At 22000 atm and 400 °C, α-B2O3 transforms into high-temperature and high-pressure monoclinic crystal β-B2O3. The conversion process is similar to the conversion of quartz to coesite under high pressure. In addition, β-B2O3 can also be obtained from liquid boron oxide crystallized at 40,000 atm and 600 °C.


The bulk modulus of β-B2O3 is very large (K = 180 GPa). The Vickers hardness of g-B2O3 and β-B2O3 are 1.5 GPa and 16 GPa, respectively.

Sales
Sales Department

Telephone: 15940764666

Landline: 0417-3902111

Website: www.yklbhg.com

Address: No. 517, Xiangyang Chemical Industry Park, Laobian District, Yingkou City, Liaoning Province

foreign
foreign trade Department

Landline: 0417-3902444

Fax: 0417-3902118

Mail box: 758007001@qq.com

Address: No. 517, Xiangyang Chemical Industry Park, Laobian District, Yingkou City, Liaoning Province

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