【摘要】 采用溶胶-凝胶法合成了Zn_0.98-xAl_0.02W_xO （x=0、 0.005、 0.01、 0.02）前驱粉体,在1 400℃、N₂氛围下烧结5 h将其煅烧成块状陶瓷。通过XRD和SEM对样品的组成和形貌进行表征,并研究了W掺杂对Zn_0.98Al_0.02O陶瓷热电性能的影响。热电测试结果表明:材料的塞贝克系数绝对值|S|随W的掺入量的增加而先减小后增大,电导率则呈现相反的变化趋势。773 K时,x=0.005样品的功率因子最大,达到3.6×10^-4W/（m·K）,比Zn_0.98Al_0.02O提高了2倍。此外,W的掺杂有效降低了材料的热导率。773 K时,x=0.005样品的无量纲优值（ZT值）达到最大,为0.03,比Zn_0.98Al_0.02O提高了2.3倍。更多还原

【Abstract】 Zn_0.98-xAl_0.02W_xO（x=0, 0.005, 0.01, 0.02） precursor powders were synthesized via a sol-gel method and their ceramics were prepared for 5 h at 1 400 ℃ in N₂ atmosphere. The phase composition and microstructure of the samples were characterized by XRD and SEM. The effects of W doping on the thermoelectric properties of Zn_0.98Al_0.02O ceramics were investigated. The absolute value of the Seebeck coefficient of the material decreased first and then increased with the increase of the amount of W, and the conductivity showed an opposite trend. The sample with x=0.005 showed the highest power factor of 3.6×10^-4 W/（m·K） at 773 K, which is twice higher than Zn_0.98Al_0.02O. In addition, the doping of W effectively reduced the thermal conductivity. The highest ZT of 0.03 was obtained by x=0.005 sample at 773 K, which was 2.3 times higher than Zn_0.98Al_0.02O.更多还原