Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (10): 1403-1407.DOI: 10.12068/j.issn.1005-3026.2019.10.007

• Materials & Metallurgy • Previous Articles     Next Articles

(Nd0.62Li0.15)TiO3 Ceramics Preparation and Thermoelectric Property Characterization

BA Yao-shuai, BA De-chun   

  1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China.
  • Received:2018-11-23 Revised:2018-11-23 Online:2019-10-15 Published:2019-10-10
  • Contact: BA De-chun
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Abstract: The ABO3 perovskite(Nd0.62Li0.15)TiO3crystal ceramic was prepared by the solid phase reaction and pressureless sintering method, and its thermoelectric properties were characterized.The results from high-resolution transmission electron microscopy(HR-TEM)show that the prepared material has a nano-superlattice structure,which causes a strong scattering of phonons at the interfaces of nano-domains, resulted in a glass-state heat conduction characteristics of the material with a thermal conductivity less than 2W/(m·K).A-site vacancy compensation can increase the electrical conductivity dramatically,while it has little effect on the thermal conductivity. The distortion of TiO6 octahedra restricts Seebeck coefficient. In the range of the tested temperature, the maximum thermoelectric dimensionless figure of merit ZT is 0.019, corresponding to the temperature of 500K.

Key words: oxide, thermal conductivity, electrical conductivity, Seebeck coefficient, thermoelectricity

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