THERMOELECTRIC CONVERSION MATERIAL

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A thermoelectric conversion material has a composition represented by General Formula LkRrTt-mMmSbx. Here, L includes at least one element selected from rare earth elements. R includes two or more elements selected from the group consisting of alkali metal elements, alkali earth metal elements, Group 4 elements, and Group 13 elements. T includes at least one element selected from Fe and Co. M includes at least one element selected from the group consisting of Ru, Os, Rh, Ir, Ni, Pd, Pt, Cu, Ag, and Au. In addition, 0.50 ≤ k ≤ 1.00, 0.1 ≤ r ≤ 0.5, 3.0 ≤ t-m ≤ 5.0, 0 ≤ m ≤ 0.5, 10.0 ≤ x ≤ 11.5, and x/t < 3.0 are satisfied.