Thermoelectric properties of pure polycrystalline CaMnO3 ceramics were significantly enhanced by increasing sintering holding time from 1 to 24 h. The Seebeck coefficient values were reduced while the sintering holding time was increased, and the DC electrical conductivity was enhanced from 255 S/m to 1.748 S/m. This same effect was observed in electronic thermal conductivity, increasing from 5x10-3 to 3.5x10-2W/m K, whereas the lattice thermal conductivity decreased from 5.0 to 4.0 W/m K at 873K. Overall, CaMnO3 ceramic sintered for 24 h demonstrated the best performance, which presented a Figure-of-Merit value of about 0.03. The grain size of the samples ranged from 2.79 μm to 6.45 μm, due to the sintering holding time, directly influencing the high-temperature thermoelectric properties of CaMnO3 ceramics.
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机译：通过将烧结保持时间从1至24小时增加，通过从1至24小时增加，显着提高了纯多晶CamnO3陶瓷的热电性能。在烧结保持时间增加时，塞贝克系数值减小，并且直流电导率从255 s / m增强至1.748 s / m。在电子热导率下观察到相同的效果，从5×10-3增加到3.5×10-2W / m k，而晶格导热率在873K时从5.0-4.0W / m k降低。总的来说，Camno3陶瓷烧结24小时，证明了最佳性能，呈现了额度约0.03的价值。由于烧结保持时间，样品的晶粒尺寸范围为2.79μm至6.45μm，直接影响Camno3陶瓷的高温热电性能。
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