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Figure 5
Building principle of one of six possible NH[_4^+] tetrahedra. (a) N1H[_4^+] tetrahedron with [\bar{3}m] symmetry. (b) N2H[_4^+] tetrahedron with 3m symmetry. Dashed lines indicate the NH[_4^+] tetrahedra orientations for a conventional model and solid lines are examples for NH[_4^+] orientations in the split-atom model. Displacement ellipsoids are drawn at the 50% probability level.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 67| Part 2| March 2011| Pages 116-121
doi:10.1107/S0108768111007269
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