摘要
通过对Ag元素掺杂的赝两元合金(PbTe)1-x(SnTe)x(0x0.4)热电性能进行研究发现,处于本征态的PbTe合金电导率对掺杂较为敏感。但当摩尔分数增大时,赝两元合金(PbTe)1-x(SnTe)x电导率随掺杂量的增大受到抑制,这在高温情况下尤为显著。当温度低于约423K时,掺杂量对PbTe合金的Seebeck系数影响不大;但当温度大于423K时,PbTe合金的Seebeck系数随掺杂量而增大。掺杂量越大,摩尔分数越高,同一合金的Seebeck系数变化越小。热电优值计算表明,掺杂0.02mol%的合金系较适宜于制作成分递变的热电材料(FGM)。
The thermoelectric properties of Ag doped pseudo-binary alloys (PbTe)(1-x)(SnTe)(x)(0less than or equal to xless than or equal to0.4) with different mole fractions have been investigated. It was found that the electrical conductivity of PbTe with intrinsic state has been significantly increased by Ag doping, whereas the enhancement of the electrical conductivities of the alloys with higher mole fractions is slowed or even inhibited due to the possible conduction change of the Ag atoms which occupy the interstitial sites acting as donor as well as the saturation in carrier concentration resulted from solubility limit of Ag in (PbTe)(0.6)(SnTe)(0.4). The Seebeck coefficients of PbTe alloys with different amount of dopant vary with temperature section, which are almost unaffected when temperature is lower than 423K, and increased with doping concentration when temperature is higher than that. In addition, the more the doping and the higher the mole fraction, the smaller the change of the Seebeck coefficients for the corresponding alloys. The calculation of figure of merit revealed that the three kinds of alloys with mole fraction ranged from 0 to 0.4 doped with 0.02 mol% Ag element can fit for the fabrication of thermoelectric material with graded composition (FGM).
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2002年第6期415-418,共4页
Rare Metal Materials and Engineering
基金
浙江省自然科学基金资助(501047)
宁波市博士基金资助(01J20102-10)
关键词
掺杂
热电性能
赝两元合金
摩尔分数
银
Ag element doping
thermoelectric properties
pseudo-binary alloys (PbTe)(1-x)(SnTe)(x)
mole fraction
