Crystal structure and transport properties of Ba<sub>8</sub>Ge<sub>43</sub>□<sub>3</sub> - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Dalton Transactions Année : 2010

Crystal structure and transport properties of Ba8Ge433

Résumé

Single phase clathrate-I Ba8Ge433 (space group (no. 230), a = 21.307(1) Å) was synthesized by use of a quenching technique. Specimens for physical property measurements were characterized by microstructure analysis and X-ray diffraction on polycrystalline samples as well as single crystals. Transport properties including thermopower, electrical resistivity, thermal conductivity and specific heat capacity were investigated in a temperature range of 2-673 K. The electrical resistivity exhibits a metal-like temperature dependence below 300 K turning into a semiconductor-like behaviour above 300 K. The analysis of the specific heat at low temperature indicates a finite density of states at the Fermi level, thus corroborating the metallic character below 300 K. The temperature dependence of the specific heat was modelled assuming Einstein-like localized vibrations of Ba atoms inside the cages of the Ge framework. A conventional crystal-like behaviour of the thermal conductivity with a low lattice contribution (kL(300 K) = 2.7 W m-1 K-1) has been evidenced.
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hal-03997210 , version 1 (20-02-2023)

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Umut Aydemir, Christophe Candolfi, Horst Borrmann, Michael Baitinger, Alim Ormeci, et al.. Crystal structure and transport properties of Ba8Ge433. Dalton Transactions, 2010, 39 (4), pp.1078-1088. ⟨10.1039/B919726E⟩. ⟨hal-03997210⟩
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