Herein, we show that we can synergistically optimize the electrical and thermal transport properties of CaMnO₃ via doping Sr. All the samples exhibit a single phase with an orthorhombic symmetry within the experimental doping range (0-10%). Sr doping significantly reduces resistivity while maintaining a relatively high absolute value of Seebeck coefficient, resulting in an effective enhancement in the electrical properties of the material. The maximum power factor (∼ 3.01 μ W cm⁻¹ K⁻²) is achieved at 873 K for Ca_0.96Sr_0.04MnO₃, which is three times larger than that of the un-doped CaMnO₃. The thermal conductivity governed by lattice thermal conductivity is notably decreased compared with the un-doped sample, which is mainly attributed to the decreased grain size and large mass and strain fluctuations caused by Sr doping, and the thermal conductivity decreases with increasing Sr doping level. The enhanced power factor and significantly reduced thermal conductivity lead to a maximum ZT value of 0.15 at 873 K in the Ca_0.90Sr_0.10MnO₃ sample, indicating that CaMnO₃ is a potential candidate for high-temperature application.

本文表明，我们可以通过掺杂Sr协同优化CaMnO ₃的电学和热学传输性质，所有样品在实验掺杂范围（0-10％）内均表现出正交相对称的单相。Sr掺杂可显着降低电阻率，同时保持较高的塞贝克系数绝对值，从而有效增强材料的电性能。Ca _0.96 Sr _0.04 MnO ₃的最大功率因数（〜3.01μW cm ^-1  K ^-2）在873 K时达到，是未掺杂CaMnO _3的三倍大。与未掺杂的样品相比，由晶格热导率控制的热导率显着降低，这主要归因于晶粒尺寸的减小以及由Sr掺杂引起的大质量和应变波动，并且热导率随Sr掺杂水平的提高而降低。Ca _0.90 Sr _0.10 MnO ₃样品中增强的功率因数和显着降低的热导率导致在873 K下最大ZT值为0.15 ，表明CaMnO ₃是高温应用的潜在候选者。