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Figure 3
A layer (001) of the structure NAHCOQ (Mukhopadhyay et al., 2010BB25). The three shortest pseudotranslations ([[3{\bar 1}0]/6], [010]/3 and [[1{\bar 1}0]/2]) are shown; only two of them are independent. The P21/c, Z′ = 6 structure seems to be derived from a C2/c, Z′ = 1 basic cell (shown as dashed) by a threefold lengthening of the axis b. That modulation is accompanied by the loss of the exact twofold axes (shown in blue) and of the centering, which becomes the pseudotranslation [110]/2 (or, [[1{\bar 1} 0]/2] = [100] − [110]/2).

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
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