(Nd0.62 Li0.15)TiO3陶瓷的制备及其热电性能

采用固相反应法与无压烧结法相结合制备了ABO₃型钙钛矿(Nd_0.62Li_0.15)TiO₃晶体陶瓷材料，并对其热电性能进行了表征.高分辨率透射电镜观察显示，制备的材料具有纳米超晶格结构，导致材料表现出玻璃态热传导特征且热导率小于2W/(m·K)，该玻璃态热传导源于超晶格结构形成的大量纳米域界面对声子的强烈散射.A位空位填充使材料的电子电导率得到了明显改善，但对材料的热导率影响不大.塞贝克系数因为TiO₆八面体的扭曲而受到一定的影响.在测试温度范围内，块体陶瓷在500K时得到了最高的无因次热电优值(ZT)0.019.

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

The ABO₃ perovskite(Nd_0.62Li_0.15)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.