CaMg 2 N 2 (trigonal, P3̄ m 1 (Nr. 164); a = 354.046(1), c = 609.079(2) pm; Z = 1) is isotypic to the anti-La 2 O 3 structure with octahedral and tetrahedral coordination for Ca 2+ and Mg 2+ ions, respectively. The compound has been prepared by the reaction o f the binary nitrides Ca 3 N 2 and Mg 3 N 2 (molar ratio 1:2) in a tungsten crucible under a pure nitrogen atmosphere at 1050 °C. The formation of the solid CaMg 2 N 2 may be interpreted in analogy to reactions o f related oxides as an acid-base reaction between the binary nitrides with different coordination tendencies of Ca 2+ and Mg 2+ ions. An analysis of the binary aristotype anti-La 2 O 3 indicates that this structure is predisposed for building ternary phases.
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SCHULTZ‐COULON et al. (1995) studied this question.