Abstract
The previous determinations [1–5] of the enthalpy of adsorption of PuO4 on the quartz surface, which was calculated with an error of ±6 kJ mol−1, are insufficiently accurate. Gas thermochromatographic experiments aimed to refine the temperature of PuO4 deposition under definite temperature and gas-dynamic conditions were performed. The carrier gas was an He-O2 mixture (1: 1). From the data obtained, more correct value of −δH a 0 was calculated: 43 ± 4 kJ mol−1. The standard enthalpy of sublimation δH 298, subl 0 of PuO4 was estimated at 35 ± 10 kJ mol−1 using the linear correlation between the enthalpies of adsorption and sublimation of transition metal oxides.
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