Thermoelectric Properties of Melt-Spun ZnxSb3 Ribbons
Thermoelectric Properties of Melt-Spun ZnxSb3 Ribbons
复制标题
熔纺ZnxSb3带材的热电性能
DOI：
10.1007/s11664-012-1910-3
复制
发表时间：
2012
影响因子：
2.1
通讯作者：
H. Nakashima
中科院分区：
文献类型：
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作者：
M. Hasaka;T. Morimura;H. Nakashima
通过单轮快淬工艺在0.6 m s-1 ~ 4.2 m s-1的速度下制备了ZnxSb 3（3.4 ≤x≤ 4.3）快淬薄带，并在673 K下退火2 h。使用X-射线衍射的结构进行了研究。在0.6 m s− 1时，β-Zn 4Sb 3与ZnSb或Zn共存;在4.2 m s−1时，β-Zn 4Sb 3与ZnSb或Zn共存，而在4.2 m s−1时，β-Zn 3Sb 2 inx ≥ 3.8，退火后β-Zn 3Sb 2消失。在旋转和退火薄带的塞贝克系数趋于略有下降，在所有的轮速度增加x。在0.6 m s-1时，由于电导率的增加，在x < 4.0时，自旋态和退火态薄带的ZT和功率因数随着x的增加而增加。在4.2 m s-1时，ZT小于0.6 m s-1时的ZT，这是因为在初纺带中电导率小，而在退火带中热导率大。
Melt-spun ribbons composed of ZnxSb3(3.4 ≤x≤ 4.3) were fabricated through a single-wheel melt-spinning process at wheel velocities of 0.6 m s−1to 4.2 m s−1and annealed for 2 h at 673 K. The structures were investigated using x-ray diffraction. The dimensionless figure of meritZT, Seebeck coefficient, and electrical conductivity were measured to estimate the power factor and thermal conductivity.β-Zn4Sb3in the as-spun ribbons coexisted with ZnSb or Zn at 0.6 m s−1, while it coexisted with ζ-Zn3Sb2inx≥ 3.8 at 4.2 m s−1, where ζ-Zn3Sb2disappeared in the annealed ribbons. The Seebeck coefficient in the as-spun and annealed ribbons tended to decrease slightly with increasingxat all the wheel velocities. At 0.6 m s−1, theZTand power factor of as-spun and annealed ribbons increased with increasingxatx< 4.0 because of increase in the electrical conductivity. At 4.2 m s−1,ZTwas smaller than that at 0.6 m s−1because the electrical conductivity was small in the as-spun ribbons and the thermal conductivity was large in the annealed ribbons.