Abstract—

(ZnO)_1 – x(NiO)_x composites (x = 0, 0.01, 0.03, 0.06) are obtained by chemical precipitation and consolidated during sintering at 1673 K without pressure. The effect of the introduction of NiO nanoparticles on thermoelectric properties of (ZnO)_{1 – x}(NiO)_x ceramics is studied in a temperature range of 400–1000 K. Phase composition and microstructure are studied using x-ray diffraction and scanning electron microscopy. The minimum value of thermal conductivity is 4.5 W m^–1 K^–1 at 1000 K for a (ZnO)_0.94(NiO)_0.06 sample, which is lower by 40% than for ZnO. A noticeable decrease in the thermal conductivity of the obtained samples is conditioned by a mixed phonon scattering mechanism on point defects and grain boundaries caused by NiO introduction. The power factor of (ZnO)_0.97(NiO)₃ composite samples is 0.7 µW cm^–1 K^–2, which is caused by reducing the Seebeck coefficient.

中文翻译：

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NiO纳米颗粒对(ZnO)1-x(NiO)x复合材料热电性能的影响

摘要——

(ZnO) _{1 –  x} (NiO) _x复合材料 ( x = 0, 0.01, 0.03, 0.06) 是通过化学沉淀获得的，并在 1673 K 无压力烧结过程中固结。在 400-1000 K 的温度范围内研究了 NiO 纳米颗粒的引入对 (ZnO) _{1 – x} (NiO) _x陶瓷热电性能的影响。使用 x 射线衍射和扫描电子显微镜研究了相组成和微观结构. a (ZnO) _0.94 (NiO) _0.06在 1000 K 时，导热系数的最小值为 4.5 W m ^–1 K ^–1样品，比 ZnO 低 40%。所得样品的热导率的显着降低是由 NiO 引入引起的点缺陷和晶界上的混合声子散射机制调节的。(ZnO) _0.97 (NiO) ₃复合材料样品的功率因数为 0.7 µW cm ^–1 K ^–2，这是由于塞贝克系数降低造成的。