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

Risk, W. P.; Rettner, C. T.; Raoux, S.
March 2009
Applied Physics Letters;3/9/2009, Vol. 94 Issue 10, pN.PAG
Academic Journal
We have employed the “3ω method” to determine the thermal conductivities of the amorphous and crystalline phases of the technologically important materials Ge2Sb2Te5, nitrogen-doped Ge2Sb2Te5, Ag- and In-doped Sb2Te, and Ge15Sb85. 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 κ 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.


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