Compounds with a `stuffed' anti-bixbyite-type structure, analysed in terms of the Zintl–Klemm and coordination-defect concepts

Vegas, A.; Martin, R.L.; Bevan, D.J.M.

doi:10.1107/S010876810803423X

Acta Crystallographica Section B
Acta Crystallographica
Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS

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Figure 9
(a) The structure of CaMg₂N₂. The hexagonal close packed (h.c.p.) layers of the Ca atoms (green spheres) are perpendicular to c. Both Mg and N atoms form bilayers in which all atoms are four-connected. The Mg atoms (grey spheres) are at the center of the regular tetrahedra. The N atoms (blue spheres) connect to four Mg atoms forming an umbrella-like, inverted tetrahedron. (b) The equivalent structure of CaAl₂Si₂. Grey and black spheres represent Al and Si atoms, respectively.

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 65| Part 1| December 2009| Pages 11-21

doi:10.1107/S010876810803423X

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