Figure 4 | Scientific Reports

Figure 4

From: Quantifying Anharmonic Vibrations in Thermoelectric Layered Cobaltites and Their Role in Suppressing Thermal Conductivity

Figure 4

Phonon densities of states and spectral partial thermal conductivities at 300 K. (a–c), Phonon density of states of layers in (a) NaCoO2, (b) Na0.5CoO2, and (c) Ca3Co4O9. (d–f), Frequency dependence of partial thermal conductivity of each type of layer in (d) NaCoO2, (e) Na0.5CoO2, and (f) Ca3Co4O9 for in-plane (X and Y) and out-of-plane (Z) directions.

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