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Low temperature transport properties and heat capacity of single-crystal Na8Si46



Stevce Stefanoski, Joshua B. Martin, George S. Nolas


The low temperature thermal conductivity, resistivity, and Seebeck coefficient of single-crystal Na8Si46 are investigated revealing the intrinsic low temperature transport properties of this material. Metallic conduction is observed, with a higher residual resistance ratio than any other known type I clathrate. Heat capacity together with thermal conductivity provide insight into the Na disorder inside the polyhedra formed by the Si framework. Single-crystal structural refinement and thermal property analyses reveal anisotropic disorder for Na inside the tetrakaidecahedra due to a reduction in the symmetry inside these polyhedra, unlike that for Na inside the dodecahedra.
Journal of Physics Condensed Matter


clathrate, transport properties, Seebeck coefficient


Stefanoski, S. , Martin, J. and Nolas, G. (2010), Low temperature transport properties and heat capacity of single-crystal Na8Si46, Journal of Physics Condensed Matter, [online],, (Accessed March 3, 2024)
Created November 17, 2010, Updated October 12, 2022