Title :
Low-temperature transport properties of Zn4Sb3 bulk crystal grown by gradient freeze method
Author :
Souma, Takeshi ; Nakamoto, Go ; Kurisu, Makio
Author_Institution :
Sch. of Mater. Sci., Japan Adv. Inst. of Sci. & Technol., Ishikawa, Japan
Abstract :
The low temperature thermoelectric properties have been investigated on Zn4Sb3 compound between 4 K and 300 K. A single phase Zn4Sb3 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 α to β phase at TSGF=257.4 K. The thermopower is positive and larger in α than in β phase. The elongation of Zn4Sb3 is small (1×10-4) at TSGF. The magnetic measurement shows that Zn4 Sb3 exhibits diamagnetism and χ(T) curve has an appreciable increase at TSGF. The power factor of a phase is two times as large as that of β phase at low-temperature region (below 300 K)
Keywords :
diamagnetic materials; electrical resistivity; magnetic susceptibility; semiconductor materials; solid-state phase transformations; thermal expansion; thermoelectric power; zinc compounds; 4 to 300 K; Zn4Sb3; bulk crystal; diamagnetism; elongation; gradient freeze method; magnetic susceptibility; metallic conduction; resistivity; structural phase transformation; structural transformation; thermal expansion; thermoelectric properties; thermopower; Conducting materials; Electric resistance; Magnetic field measurement; Powders; Temperature measurement; Thermal conductivity; Thermal resistance; Thermoelectricity; X-ray diffraction; Zinc;
Conference_Titel :
Thermoelectrics, 2001. Proceedings ICT 2001. XX International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-7205-0
DOI :
10.1109/ICT.2001.979886
