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We investigated the thermal expansion properties of a component in order to develop a thermoelectric generating device using a Pb-Te system comprising PbTe doped with 0.5 wt%PbI2 and Pb0.5Sn0.5Te, which were selected for n- and p-type legs, respectively, and Ni and Fe, which were selected for the electrodes. [1] The dependence of the thermal expansion coefficient on the crystal grain size of the leg...