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- W814786716 abstract "This paper presents the transport properties of several composition tuned $ensuremath{alpha}$- and $ensuremath{beta}text{ensuremath{-}}{mathrm{Eu}}_{8}{mathrm{Ga}}_{16ensuremath{-}x}{mathrm{Ge}}_{30+x}$ samples where $0.28ensuremath{leqslant}xensuremath{leqslant}0.48$ for the $ensuremath{alpha}$ samples and $0.49ensuremath{leqslant}xensuremath{leqslant}1.01$ for the $ensuremath{beta}$ samples. Among samples with the same structure ($ensuremath{alpha}$ or $ensuremath{beta}$), the varying physical properties can be understood in terms of a rigid conduction band where only the charge carrier concentration is varied. The differences in the physical properties between $ensuremath{alpha}$ and $ensuremath{beta}$ samples can be explained by a charge-carrier effective mass $({m}^{*})$ that is more than three times larger in the $ensuremath{beta}$ phase than in the $ensuremath{alpha}$ phase. As a result of the low charge-carrier mobility we argue that the thermoelectric figure of merit of $n$-type $ensuremath{alpha}$- and $ensuremath{beta}text{ensuremath{-}}{mathrm{Eu}}_{8}{mathrm{Ga}}_{16ensuremath{-}x}{mathrm{Ge}}_{30+x}$, without modifications to enhance the thermoelectric properties, will not exceed that of the best materials at room temperature. From modeling the lattice thermal conductivity $({ensuremath{kappa}}_{L})$ of $ensuremath{alpha}$- and $ensuremath{beta}text{ensuremath{-}}{mathrm{Eu}}_{8}{mathrm{Ga}}_{16ensuremath{-}x}{mathrm{Ge}}_{30+x}$, it is proposed that ${ensuremath{kappa}}_{L}$ of all clathrates with divalent cations can be described by phonon-charge-carrier scattering at low temperatures and resonant scattering at higher temperatures. This contradicts earlier models where the low-temperature ${ensuremath{kappa}}_{L}$ of $ensuremath{beta}text{ensuremath{-}}{mathrm{Eu}}_{8}{mathrm{Ga}}_{16}{mathrm{Ge}}_{30}$ and ${mathrm{Sr}}_{8}{mathrm{Ga}}_{16}{mathrm{Ge}}_{30}$ is modeled by scattering of phonons from tunneling states. However, since the phonon-charge-carrier scattering rate increases with ${({m}^{*})}^{2}$ the advantage of the phonon-charge-carrier scattering model is the ability to explain the lower low-temperature ${ensuremath{kappa}}_{L}$ of $ensuremath{beta}text{ensuremath{-}}{mathrm{Eu}}_{8}{mathrm{Ga}}_{16ensuremath{-}x}{mathrm{Ge}}_{30+x}$, compared to $ensuremath{alpha}text{ensuremath{-}}{mathrm{Eu}}_{8}{mathrm{Ga}}_{16ensuremath{-}x}{mathrm{Ge}}_{30+x}$." @default.
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- W814786716 date "2005-04-18" @default.
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- W814786716 title "Transport properties of composition tuned<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>α</mml:mi></mml:math>- and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>β</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi mathvariant=normal>Eu</mml:mi><mml:mn>8</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>Ga</mml:mi><mml:mrow><mml:mn>16</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:…" @default.
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- W814786716 doi "https://doi.org/10.1103/physrevb.71.165206" @default.
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