Abstract
Two strontium cyanamide polymorphs (trigonal low temperature phase and orthorhombic high temperature phase) were prepared by firing strontium acetate in ammonia flowing at 600-850°C. Trigonal low temperature phase irreversibly changed to orthorhombic high temperature phase by post annealing. The two structures differed in SrN6 octahedon linkage and (NCN)2- arrangement. The structural change was discussed in relation to repulsion between strontium cations and SrN6 octahedron linkage by corner or edge sharing.
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