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Figure 2
Structural representations of the β-Pna21 (a), (b) and the hypothetical α-Pna21 structure (c), (d). Views are along the crystallographic c axis (a), (c) and as a general view (b), (d). All crystallographically independent cation positions are highlighted as large spheres in different colours, while the nitro­gen atoms are very small to increase visibility of the cations. The crystal structure of the α-Pna21 structure was constructed from the wurtzite type using the TRANSTRU tool of the Bilbao Crystallographic server (Aroyo, Perez-Mato et al., 2006BB3; Aroyo, Kirov et al., 2006BB1; Aroyo et al., 2011BB2).

ISSN: 2053-2733
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