Thermal conductivities and phase transition temperatures of various phase-change materials measured by the 3ω method

摘要

We have employed the "3ω method" to determine the thermal conductivities of the amorphous and crystalline phases of the technologically important materials Ge_2Sb_2Te_5, nitrogen-doped Ge_2Sb_2Te_5, Ag- and In-doped Sb_2Te, and Ge_(15)Sb_(85). We used the "3ω voltage" as a monitor of thermal conductivity that allowed us to observe the amorphous-to-crystalline phase transition as the material was annealed. For these materials, our results reveal that the thermal conductivity k is related to the electrical conductivity σ by an empirical relationship of the form κ=σLT+0.175 W/m K, where L is the Lorenz number and T is temperature.