Geometric configuration of polyhedrons dominating particle- to wave-like thermal transport in single crystalline Cs3Bi2I9

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Figure 3

Temperature-dependent powder XRD patterns (a), lattice parameters (b) and thermal conductivity (c) for Cs₃Bi₂I₉. Literature in the plot is polycrystalline Cs₃Bi₂I₉ [15]. (d) Room-temperature thermal conductivity for single-crystal and polycrystalline Cs₃Bi₂I₉ along with a comparison to that of literature thermal insulators [6,7,26,36–40].

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