The structural properties of boron oxide boron nitride manufacturers tell you.
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. Boron oxide
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.
Boron Nitride
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.
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