Figure 4
From: On the Chemistry and Physical Properties of Flux and Floating Zone Grown SmB6 Single Crystals
(a) Structural depiction of SmB6. (b) The intra boron-boron bond distances normalized by the inter boron-boron distances (Intra B-B/Inter B-B) of the B6 octahedral cluster for selected hexaborides versus different charges of the B6 cluster (B6x) (■). Also shown is the Intra B-B/Inter B-B for all SmB6 FZ cuts and the FG SmB6 sample (blue dashed line). The charge on the B6 cluster for SmB6 mostly closely resembles −3, but is slight reduced, consistent with a partial mixed valency. The curved solid line serves as a guide to the eye.
