Boron anhydride as colorless glass crystal or powder, odorless, surface smooth in feeling. Strongly absorbing generation of boric acid in the air, in the high temperature can be reduced by alkali metal or magnesium, aluminum as monomer boron. Boron oxide soluble in acid, ethanol, hot water, slightly soluble in cold water, and some metal boron glass can be synthesized with characteristics of the color, can with alkali metal, copper, silver, aluminum, arsenic, tin oxides completely miscible. Crystalline boron oxide density is 2.46g/cm3, the amorphous boron oxide density for 1.80~1.84g/ cm3, melting point: 557 ℃, solubility: (g/100gH2O): 1.1 (0 ℃), 15.7 (100 ℃) is easy to absorb water, turbid state after moisture absorption, can be dissolved in alcohol. At lower temperatures, H3BO3 dehydration can get three oxidation two boron crystal. The BO4 crystal with tetrahedral structural units, the density of 1.805g · cm-3, melting point 450 ℃. Vitreous boron oxide density of 1.795 g · cm-3, when the temperature rises gradually softened, the liquid becomes at red heat, boiling point at 1500 ℃. Boron and oxygen directly to B2O3.
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