论文部分内容阅读
采用固相合成法及放电等离子烧结制备了Ca3Co4(FxO1-x)9(x=0,0.01,0.02)块体样品,系统研究了氟(F)掺杂对Ca3Co4O9微观结构和热电性能的影响。结果表明:F掺杂样品均为单一化合物。在300～900K,与纯样相比,F掺杂样品的Seebeck系数变化较小,电导率显著增大,热导率先减小后随F掺量的增加而增大。x=0.01时,样品具有最高电导率和最低热导率,分别为14×103S/m和2.16W/(m·K)。在900K,样品最大热电优值(ZT值)为0.16,较纯样品的提高了近100%。
The samples of Ca3Co4 (FxO1-x) 9 (x = 0,0.01,0.02) were prepared by solid state synthesis and spark plasma sintering. The effects of fluorine (F) doping on the microstructure and thermoelectric properties of Ca3Co4O9 were studied systematically. The results show that all the F-doped samples are single compounds. At 300-900K, compared with the pure sample, the Seebeck coefficient of the F-doped sample changes little, the conductivity increases significantly, and the thermal conductivity decreases first and then increases with the increase of the F content. At x = 0.01, the samples have the highest conductivity and the lowest thermal conductivity of 14 × 103 S / m and 2.16 W / (m · K), respectively. At 900K, the maximum thermoelectric figure of merit (ZT value) was 0.16, which was nearly 100% higher than the pure sample.