Electron spin resonance studies of decomposition intermediates in strontium and barium nitrates, including pyrolytically produced no 2–3
Abstract
Sr(NO3)2 and Ba(NO3)2, melt-recrystallized and partly decomposed, gave an e.s.r. spectrum assigned to NO2–3, with hyperfine splitting slightly different from that of NO2–3 in X-irradiated Sr(NO3)2. The Ba compound showed additional lines attributable to a single Ba nucleus. The NO2–3 apparently resides in the decomposition product, SrCO3 from atmospheric CO2. It is proposed that NO2–3 is a decomposition intermediate in nitrate melts.
X-irradiated Sr(NO3)2 showed, at 296 K, signals attributed to NO2 and O–3, in conformity with the work of Žďánský and Šroubek, except that we reverse their assignments of g∥ and g⊥ in O–3. Irradiation at 77 K did not yield NO2–3 as reported by Žďánský and Šroubek for 90 K, but gave a spectrum which is probably that of NO3.
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