梯度冷冻法制备Zn/sub - 4/Sb/sub - 3块状晶体的低温输运特性

Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589) Pub Date : 2001-06-08 DOI:10.1109/ICT.2001.979886

T. Souma, G. Nakamoto, M. Kurisu

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引用次数: 5

摘要

研究了Zn/sub - 4/Sb/sub - 3/化合物在4k ~ 300k范围内的低温热电性能。采用梯度冻结法制备了密度为理论密度95.4%的Zn/sub 4/Sb/sub 3/块状单相晶体。在T/sub / S/ sup GF/=257.4 K时，电阻率表现为金属传导，并伴有从/spl α /相向/spl β /相转变的异常。在/spl α /相中热功率为正，且大于/spl β /相。在T/sub /S /sup GF/下，Zn/sub / 4/Sb/sub / 3/的伸长率很小(1/ sp1倍/10/sup -4/)。磁测结果表明，Zn/sub 4/Sb/sub 3/呈现抗磁性，/spl chi/(T)曲线在T/sub S//sup GF/处有明显的增大。在低温区(低于300k)，一个相的功率因数是/spl β /相的两倍。

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Low-temperature transport properties of Zn/sub 4/Sb/sub 3/ bulk crystal grown by gradient freeze method

The low temperature thermoelectric properties have been investigated on Zn/sub 4/Sb/sub 3/ compound between 4 K and 300 K. A single phase Zn/sub 4/Sb/sub 3/ bulk crystal with the density of 95.4% of the theoretical has been grown by a gradient freeze method. The resistivity exhibits a metallic conduction with an anomaly associated with a structural transformation from /spl alpha/ to /spl beta/ phase at T/sub S//sup GF/=257.4 K. The thermopower is positive and larger in /spl alpha/ than in /spl beta/ phase. The elongation of Zn/sub 4/Sb/sub 3/ is small (1/spl times/10/sup -4/) at T/sub S//sup GF/. The magnetic measurement shows that Zn/sub 4/Sb/sub 3/ exhibits diamagnetism and /spl chi/(T) curve has an appreciable increase at T/sub S//sup GF/. The power factor of a phase is two times as large as that of /spl beta/ phase at low-temperature region (below 300 K).

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Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589)

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