De Gruyter, Zeitschrift für Kristallographie - Crystalline Materials, 6(229), p. 427-434, 2014
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Abstract The framework structure of O-mayenite (Ca12 Al14 O33) allows the substitution of extra framework oxygen anions by various anions. In this study we present two new anion substituted phases. Oxidation of CN-mayenite leads to the formation of NO2-mayenite and, in addition, there are some hints to a very unusual species present in N-mayenite: the hydrazide anion.