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Enhanced phonon scattering by mass and strain field fluctuations in Nb substituted FeVSb half-Heusler thermoelectric materials
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10.1063/1.4772605
/content/aip/journal/jap/112/12/10.1063/1.4772605
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/12/10.1063/1.4772605

Figures

Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

(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.

Image of FIG. 4.
FIG. 4.

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 calΓ m.

Image of FIG. 5.
FIG. 5.

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.

Tables

Generic image for table
Table I.

The fitting parameters determined from Eq. (9) and the calculated Debye temperature θ D and sound velocity υ.

Generic image for table
Table II.

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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/content/aip/journal/jap/112/12/10.1063/1.4772605
2012-12-28
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Enhanced phonon scattering by mass and strain field fluctuations in Nb substituted FeVSb half-Heusler thermoelectric materials
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/12/10.1063/1.4772605
10.1063/1.4772605
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