Temperature dependences of thermal diffusivity (a), and thermal conductivity (b) of the FeV1− x Nb x Sb (x = 0, 0.1, 0.2, 0.3, and 0.4) compounds. The inset in (a) is the measured specific heat.
Temperature dependence of Lorenz constant (a) and κ L (b) of the FeV1− x Nb x Sb (x = 0, 0.1, 0.2, 0.3, and 0.4) compounds. The κ L/κ L0 (κ L0 donates the lattice thermal conductivity of pure FeVSb compound) is plotted against the Nb content in the inset.
(a) Low temperature specific heat of FeV1− x Nb x Sb (x = 0, 0.2, and 0.4), and (b) the temperature dependence Cp/T VS T 2 from 3 K to 6 K.
The calculated disorder parameter Γ for FeV1− x Nb x Sb (x = 0.2 and 0.4) compounds. The strain field fluctuation Γ s is given by Γ s = Γ cal − Γ m.
Temperature dependences of electrical conductivity (a) and Seebeck coefficient (b) of the FeV1− x Nb x Sb (x = 0, 0.1, 0.2, 0.3, and 0.4) compounds.
The fitting parameters determined from Eq. (9) and the calculated Debye temperature θ D and sound velocity υ.
Room temperature lattice thermal conductivity, κ L, disorder scaling parameter, u, disorder scattering parameters Γ expt, Γ m, Γ s, and the strain field related adjustable parameter ε.
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