Unlike any other known crystalline silicate, the reduced nitridosilicate SrSi6N8 contains SiSi single bonds (see picture). The SiSi distance is 235 pm, which precisely matches that in diamond-type silicon. The SiSi unit is embedded in a framework of corner-sharing SiN4 tetrahedra. Thus, Si4+ and Si3+ coexist within the same framework structure.
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Stadler et al. (2004) studied this question.
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