Table 1 Overall, partial and layer phonon thermal conductivities for NaxCoO2 (x = 1.0, 0.5) and Ca3Co4O9 at 300 K.

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

 

NaCoO2

Na0.5CoO2

Ca3Co4O9

X

Y

Z

X

Y

Z

X

Y

Z

\({\kappa }_{{\rm{overall}}}\)

44.55 ± 1.67

43.39 ± 1.92

19.01 ± 1.37

16.69 ± 0.19

14.11 ± 0.49

3.71 ± 0.05

6.60 ± 0.15

7.24 ± 0.28

3.32 ± 0.58

\({\kappa }_{{{\rm{CoO}}}_{2}}\)

38.23

36.84

14.82

16.33

13.80

3.31

4.67

5.11

1.47

\({\kappa }_{{\rm{adj}}}\)

6.32

6.56

4.20

0.37

0.32

0.41

1.93

2.13

1.85

\({\kappa \text{'}}_{{{\rm{CoO}}}_{2}}\)

57.07

54.99

22.12

25.92

21.90

5.25

13.21

14.46

4.16

\({\kappa \text{'}}_{{\rm{adj}}}\)

19.14

19.86

12.71

0.99

0.85

1.10

2.99

3.29

2.86

  1. Directions X, Y and Z refer to the Cartesian coordinate system, with X parallel to the a axis, Y parallel to the b axis, and Z perpendicular to the ab plane (and CoO2 layers); “adj” stands for layers adjacent to CoO2 layers.
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