Symmetry and twins in the monophosphate tungsten bronze series (PO2)4(WO3)2m (2 ≤ m ≤ 14)

Roussel, P.; Labbé, P.; Groult, D.

doi:10.1107/S0108768199016195

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

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Figure 10
Different possible tilting modes in the successive slabs of the structure. Arrows are symbolic representations of the WO₆ octahedral tilting (see Figs. 8

and 9

). (a) P2₁2₁2₁-type: the tilting direction remains the same from one slab to the next. (b) Local defect as the (001) mirror involving the change of tilting direction keeping the pentagonal tunnel shape. (c) P2₁cn-type: the tilting-sense is reversed from one slab to the next. (d) Local defect as found in MPTBh members leading to hexagonal-shaped tunnels.

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 56| Part 3| June 2000| Pages 377-391

doi:10.1107/S0108768199016195

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