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.
, Martin, J.
and Nolas, G.
Low temperature transport properties and heat capacity of single-crystal Na8Si46, Journal of Physics Condensed Matter, [online], https://doi.org/10.1088/0953-8984/22/48/485404, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=906133
(Accessed March 3, 2024)