Dibortrioxid

For R&D use onlynot for drug household or other uses.

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 spectroscopic properties in excellent agreement with experiment. The rings are thought to make a few BO3 triangles but mostly link (polymerize) into ribbons and sheets. The crystalline form (-B2O3) (see structure in the infobox) is exclusively composed of BO3 triangles. This trigonal quartz-like network undergoes a coesite-like transformation to monoclinic -B2O3 at several gigapascals (9.5 GPa).