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Figure 4
(a) Polyhedral view of PST at 4 K. The Ta-centered polyhedra are darkly shaded, while the Sc-centered polyhedra are left unshaded. Pb atoms are the large lightly shaded spheres and the O ions are represented by the small white spheres. (b) The structure of PST at 4 K, illustrating short Pb—O bonds (<2.7 Å). The Ta atoms are represented by darkly shaded spheres, Sc by medium-sized white spheres, Pb by the large lightly shaded spheres, and O by the small white spheres. |