207Pb NMR of Solid Solutions of Divalent Metal Nitrates

207Pb NMR spectra of mixed crystals of anhydrous lead and strontium nitrate show up to 13 lines, arising from lead ions with 0−12 Pb2+ nearest-neighbor cations replaced by Sr2+. The shifted lines are further split by the multiplicity of inequivalent nearest-neighbor replacements. The average shift per Sr2+ ion is 21.8 ppm. Similar but somewhat smaller effects are seen in [Pb,Ba](NO3)2 mixed crystals. The intensities of the resonances can be fit to Monte Carlo models of Pb2+ and Sr2+ ion distributions and are consistent with like nearest-neighbor pairs being 120 J/mol lower in energy than unlike pairs.