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Figure 8
Hydrogen-bond net in the unit formula of: (a) tetragonal phase P4/mnc; (b) cubic low-temperature phase [Pa\bar 3]. Coordination of two independent ammonium ions by octahedra in: (c) the tetragonal phase P4/mnc and (d) cubic phase [Pa\bar 3].

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
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