Abstract
The structural organization of nitridic ceramics in the system Si/B/N/C on an intermediate length scale is studied using 29Si{11B} rotational echo adiabatic passage double resonance (REAPDOR) and 11B{29Si} rotational echo double resonance (REDOR) NMR spectroscopy. The experiments are performed on a 100% 29Si enriched 29Si3B3N7 ceramic material, obtained by ammonolysis and subsequent pyrolysis of the single-source precursor molecule ((trichlorosilyl)amino)dichloroborane (TADB, Cl329SiNHBCl2). Simulations of the resulting double resonance curves on the basis of multiple spin interactions are presented. The double resonance data is supported by additional 11B and 29Si static dipolar spin−echo experiments. The combined results obtained from the different experimental approaches indicate an unexpected connectivity motif in these ceramics, characterized by regions of mainly Si−N−Si linkages and islands of predominantly B−N−B connectivities.
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