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Figure 2
The threefold coordination of Ag in the [(Ag,Cu)6Sb2S7]2− A (A′) module layer and the connection between the [AgS3]5− triangular units (arrangement valid for both the 222- and 221-polybasite structures, labelling for the 222-structure only). Although not in the A (A′) module layer, S16 and S20 at longer Ag—S distances are included for completeness.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
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