Abstract
Differential scanning calorimetry (DSC) has been applied to the study of the fast reaction of boron with lead monoxide, and bomb calorimetry has been utilized to compare experimental and theoretical heats of reaction. DSC traces were obtained for PbO/B compositions (80/20, 50/50 and 97/3 wt%) and also for PbO/B 20 3 (1:1) mixtures, utilizing scan rates of 5, 10 and 20 ° min −1 and conducting the measurements under an atmosphere of argon (20ml min −1). Two well-defined exothermic peaks were obtained in the DSC traces and analysis of the data, together with examination of infra-red spectra, indicated the presence of B 20 3 and Pb in the reaction products. The excess heat outputs, at PbO levels above the stoichiometric level, are explained by the exothermic reaction of PbO with B 20 3 to form clear, slightly yellow glasses. The formation of a surface-coating of B 2O 3 on the boron particles has an important effect on the rate of the main PbO-B reaction.
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