Influence of NiO Nanoparticles on the Thermoelectric Properties of (ZnO)1 – x(NiO)x Composites

• Published in: Nanobiotechnology Reports (Online) 2021, Vol.16 (3), p.381-386
• Main Authors: Chernyshova, E., Serhiienko, I., Kolesnikov, E., Voronin, A., Zheleznyy, M., Fedotov, A., Khovaylo, V.
• Format: Article
• Language: English
• Subjects: Chemical precipitation; Chemistry and Materials Science; Composite materials; Crystal defects; Functional and Construction Nanomaterials; Grain boundaries; Heat conductivity; Heat transfer; Industrial and Production Engineering; Machines; Manufacturing; Materials Science; Nanoparticles; Nanotechnology; Nickel oxides; Phase composition; Point defects; Power factor; Pressure effects; Processes; Seebeck effect; Thermal conductivity; Thermoelectricity; Zinc oxide
• ISSN: 2635-1676; 1995-0780; 2635-1684; 1995-0799
• DOI: 10.1134/S2635167621030034

— (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.