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Kumar et al. Energy Mater. 2025, 5, 500109 https://dx.doi.org/10.20517/energymater.2025.22 Page 11 of 17
Figure 6. (A) Temperature-dependent total thermal conductivities κ total (T); (B) temperature-dependent Lorenz numbers L(T); (C)
temperature-dependent lattice and bipolar thermal conductivities κ + κ (T) of the hot-pressed BST+HEA (x = 0, 0.1, 0.5, and 1.0 vol%)
L
x
b
samples for Pa- and Pe-directions; (D) room-temperature lattice thermal conductivities κ as a function of the HEA concentrations.
L
HEA: High entropy alloy; BST: Bi Sb Te .
0.4 1.6 3
(4)
(5)
(6)
where S is the temperature-dependent Seebeck coefficient, F (η) is the n-th order Fermi integral, r is
n
scattering parameter (r = -1/2 for the acoustic phonon scattering), and η = E /k T is the reduced E F [38,39] .
F
B
