Raman data have been obtained for vitreous and molten B2O3 from −196 to 1594 °C. A ΔH° of 6.4±0.4 kcal/mole boroxol was obtained from the temperature dependence of ratios of integrated Raman intensities. This heat is thought to correspond to the transformation of BO3 triangles in boroxol rings, to BO3 triangles in a random network. Vitreous B2O3 is composed predominantly of boroxol rings, but the boroxol ring concentration decreases with increasing temperature in the melt, and becomes small at temperatures above 1600 °C.
bene) was used.(24) From the effect of NaO on radiation-induced isomerization of 0.25 M cis-2-butene in benzene, a value of «G, = 2 has been estimated by R. B. Cundall and W. Tippett, Advances in Chemistry Series, No.
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