High-efficiency thermoelectric Ba₈Cu₁₄Ge₆P₂₆: bridging the gap between tetrel-based and tetrel-free clathrates.

ABSTRACT: A new type-I clathrate, Ba₈Cu₁₄Ge₆P₂₆, was synthesized by solid-state methods as a polycrystalline powder and grown as a cm-sized single crystal via the vertical Bridgman method. Single-crystal and powder X-ray diffraction show that Ba₈Cu₁₄Ge₆P₂₆ crystallizes in the cubic space group Pm3n (no. 223). Ba₈Cu₁₄Ge₆P₂₆ is the first representative of anionic clathrates whose framework is composed of three atom types of very different chemical natures: a transition metal, tetrel element, and pnicogen. Uniform distribution of the Cu, Ge, and P atoms over the framework sites and the absence of any superstructural or local ordering in Ba₈C

SUBMITTER: Wang J 

PROVIDER: S-EPMC5853772 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature