论文标题
SB掺杂Alfe的热电特性$ _2 $ b $ _2 $
Thermoelectric properties of Sb doped AlFe$_2$B$_2$
论文作者
论文摘要
在这项工作中，Al $ _ {1.2} $ fe $ _2 $ b $ _2 $化合物的热电特性在从300 \，k到773 \，k的温度范围内进行了研究。 Al $ _ {1.2} $ fe $ _2 $ b $ _2 $化合物是由Al，Fe和B的真空弧熔化产生的，然后在Argon Alternere下在1323 K处退火。随后将退火的锭压入粉末中，并在真空下以1273 k的速度将其热压。热压合金主要包含Al $ _ {1.2} $ fe $ _2 $ _2 $ b $ _2 $相位，而2月份的一小部分，在0.1 \％\％sb掺杂以al $ _ {1.2} $ _ {1.2} $ _2} $ _2 $ _2 $ _2 $ b $ b $ _2 $中进一步减少。原始的Al $ _ {1.2} $ fe $ _2 $ b $ _2 $展示了N型电导率，最大功绩（ZT）为0.03，为773 \ k。 SB掺杂在高温下改善了塞贝克系数，还降低了所研究温度范围内的声子导热率。声子导热率的降低归因于Fe和SB原子之间的质量波动引起的点 - 缺陷的声子散射。尽管在Al $ _ {1.2} $ _ {1.2} $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $中，但在Fe网站上的0.1 at \％SB掺杂在773 \，k时的Zt倍数提高了0.056。
In this work, thermoelectric properties of Al$_{1.2}$Fe$_2$B$_2$ compound were investigated over a temperature range from 300\,K to 773\,K. Al$_{1.2}$Fe$_2$B$_2$ compound was produced by vacuum arc melting of Al, Fe, and B followed by annealing at 1323 K under argon atmosphere. The annealed ingots were subsequently crushed into powder and hot pressed at 1273 K under vacuum. The hot-pressed alloy predominantly contained Al$_{1.2}$Fe$_2$B$_2$ phase with a small fraction of FeB, which decreases further upon 0.1 \% Sb doping in Al$_{1.2}$Fe$_2$B$_2$. The pristine Al$_{1.2}$Fe$_2$B$_2$ exhibits n-type conductivity with a maximum figure of merit (zT) of 0.03 at 773\,K. The Sb doping improves the Seebeck coefficient at high temperatures and also reduces the phonon thermal conductivity across the temperature range studied. The decrease in phonon thermal conductivity is attributed to the point-defect phonon scattering due to mass fluctuation between the Fe and Sb atoms. The 0.1 at\% Sb doping at the Fe site results in improved zT of 0.056 at 773\,K in spite of its limited dissolution in Al$_{1.2}$Fe$_2$B$_2$ and forms FeSb$_2$ secondary phase.
