In this work, we fabricate perovskite-type Ca_1-x-yLa_xSr_yMnO₃ thermoelectric materials using co-precipitation method, followed by cold pressing and hot sintering. The La/Sr dual doping modifies chemical composition and bonding properties of CaMnO₃, resulting in improved electrical transport properties with tunable carrier concentration, carrier mobility and effective mass. Meanwhile, the phonon transport properties are also influenced, reflected by the reduced lattice thermal conductivity of Ca_1-x-yLa_xSr_yMnO₃. As a result, Ca_0.94La_0.02Sr_0.04MnO₃ shows significantly enhanced power factor up to 374 μW·m^-1·K^-2 and figure of merit up to ∼0.22 at 973 K, which is ∼144% higher than those of pristine CaMnO₃. This study rationalizes a potential strategy to improve the thermoelectric performance of CaMnO₃-based materials.

在这项工作中，我们使用共沉淀法制造钙钛矿型Ca _1-xy La _x Sr _y MnO ₃热电材料，然后进行冷压和热烧结。La / Sr双重掺杂改变了CaMnO _3的化学组成和键合特性，从而改善了电传输性能，可调整载流子浓度，载流子迁移率和有效质量。同时，Ca _1-xy La _x Sr _y MnO ₃的降低的晶格导热率也影响了声子的传输性能。结果，Ca _0.94 La _0.02 Sr _0.04MnO _3的功率因数高达374μW ·m ^-1 ·K ^-2，在973 K下的品质因数高达〜0.22，比原始的CaMnO ₃高144％。这项研究合理化了一种潜在的策略，以改善CaMnO ₃基材料的热电性能。