High Pressure Synthesis and Electrical Properties of Ag1-xPb18SbTe20
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摘要: 采用高压方法制备了Ag偏离化学计量比的Ag1-xPb18SbTe20(x=0, 0.3, 0.6)样品,研究了Ag含量及温度对样品电学输运性能的影响。X射线衍射测试结果表明,样品具有单相NaCl结构,晶格常数随Ag含量的减少而变小。电学输运性能测试表明:与常规制备方法相比,高压方法制备的AgPb18SbTe20样品的电导率较高;样品电导率随x的增大而逐渐增大,x=0.6时,室温条件下的样品电导率高达1 598.4 S/cm。随着温度的升高,Seebeck系数增大,电导率减小。300 ℃时,Ag0.4Pb18SbTe20样品的功率因子达到最大值,约为1.97 mW/(m·K2)。Abstract: Thermoelectric materials Ag1-xPb18SbTe20 (x=0, 0.3, 0.6) were synthesized by high pressure method.The composition dependent electrical properties were studied from room temperature to 500 ℃.The result of X-ray diffraction indicates that Ag1-xPb18SbTe20 samples have the structure of NaCl crystal.As Ag content decreases, the lattice constant decreases.The measurement results of electrical properties show that the electrical conductivity of Ag1-xPb18SbTe20 samples synthesized by high pressure is much higher than that of other preparing methods.The electrical conductivity increases with x, and its maximum value reaches 1 598.4 S/cm at room temperature for the Ag0.4Pb18SbTe20 sample.As the temperature rises, Seebeck coefficient increases and electrical conductivity decreases.The maximum power factor reaches 1.97 mW/(m·K2) at 300 ℃ for the Ag0.4Pb18SbTe20 sample.
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Key words:
- high pressure /
- electrical properties /
- X-ray diffraction /
- Seebeck coefficient
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