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- W2033116626 abstract "Phase relations at subsolidus temperatures as well as at $T=800phantom{rule{0.2em}{0ex}}ifmmode^circelsetextdegreefi{}mathrm{C}$, crystallographic data, electrical and thermal transport measurements, and heat capacity data are reported for several compositions within the clathrate type-I solid solution: ${mathrm{Ba}}_{8}{mathrm{Pd}}_{x}{mathrm{Ge}}_{46ensuremath{-}xensuremath{-}y}{◻}_{y}$ (◻ is a vacancy). The solid solution derives from binary clathrate ${mathrm{Ba}}_{8}{mathrm{Ge}}_{43}{◻}_{3}$ with a solubility limit of 3.8 Pd atoms per formula unit at $T=800phantom{rule{0.2em}{0ex}}ifmmode^circelsetextdegreefi{}mathrm{C}$. Structural investigations throughout the homogeneity region confirm cubic primitive symmetry consistent with the space group type $Pmoverline{3}n$ and lattice parameters ranging from $a=1.0657(2)phantom{rule{0.3em}{0ex}}mathrm{nm}$ for ${mathrm{Ba}}_{8}{mathrm{Ge}}_{43}{◻}_{3}$ to $a=1.077phantom{rule{0.2em}{0ex}}41(2)phantom{rule{0.3em}{0ex}}mathrm{nm}$ for ${mathrm{Ba}}_{8}{mathrm{Pd}}_{3.8}{mathrm{Ge}}_{42.2}{◻}_{0.0}$. The primary field of clathrate crystallization has been elucidated from micrography and differential thermal analyses. Both heat capacity and inelastic neutron diffraction define a low-lying, almost localized, phonon branch. Studies of transport properties evidence electrons as the majority charge carriers for most of the homogeneity region; however, at the Pd-rich limit, holes dominate the electronic transport. The crossover between both regimes provides appropriate conditions for attractively high Seebeck values. The lattice contribution dominates the overall thermal conductivity." @default.
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- W2033116626 date "2007-10-31" @default.
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- W2033116626 title "Clathrate formation in the Ba-Pd-Ge system: Phase equilibria, crystal structure, and physical properties" @default.
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- W2033116626 doi "https://doi.org/10.1103/physrevb.76.144118" @default.
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